6 Google Ad Account Red Flags You've Probably Missed (But Are Costing You Money)

Most Google Ads problems don't announce themselves; there's no alert, no warning from Google saying "Hi 👋, you're wasting £800 a month here." They just quietly drain your budget while your dashboard shows metrics that look, on the surface, perfectly fine.

That's what makes these issues so expensive. You can be running an account that spends £200 per day and reports a rosy ROAS of x15 but then you notice impressions are down 45% year-on-year, while your spend is up 275%. How is that possible if everything is working so well?

Welcome to the world of hidden ad account problems.

Here are the top six red flags we’ve been spotting in recent audits… and why they're expensive to ignore.

Red Flag #1: Your Conversion Tracking Is Broken (And You Don't Know It)

This is the most costly red flag on the list. Every bid adjustment, every budget allocation, every campaign optimisation is built on top of your conversion data. If that data is wrong, you're essentially burning money based on a lie.

The most common issues are purchase conversions firing multiple times per order, inflating your reported ROAS, revenue values not passing through correctly, so Google's smart bidding is optimising toward the wrong target, and browser-based tracking that misses a growing percentage of iOS users entirely - meaning real sales go uncounted while phantom conversions skew your decisions.

The result is an account that appears to be performing better than it is. Your reported ROAS looks healthy,  but your actual return is considerably lower… and your budget keeps flowing toward campaigns that are, in reality, underperforming.

Your conversion setup needs regular health checks for accuracy and alignment with your Shopify store.

Red Flag #2: Your Product Feed Has Silent Errors

For Shopify brands running Shopping or Performance Max, your product feed is the engine behind everything. Most brands set it up once and never look again. That's where the waste starts.

Feeds degrade, products get disapproved for policy violations you didn't know existed, titles get truncated, stripping out the keywords Google needs to match your listings to relevant searches, pricing discrepancies trigger disapprovals that silently remove products from Shopping entirely - your campaigns keep running, your budget keeps spending, but a chunk of your catalogue has gone dark.

None of this shows up in your campaign dashboard. You won't see it unless you log into Google Merchant Center and check the diagnostics directly. Even a 10–15% disapproval rate can mean your highest-margin products aren't showing up at all, while your budget gets allocated elsewhere.

Check those feeds!

Red Flag #3: You're Losing Impression Share and Don't Know the Cost

Impression share tells you how often your ads appeared versus how often they were eligible to. The gap between 100% and your actual figure is the opportunity you're missing, and the wasted potential in your current budget.

Lost impression share (budget) means your ads stop showing at midday because you've run out of money. Qualified buyers searching for your product in the afternoon see a competitor instead. You've already paid to be in that auction, you just didn't show up.

Lost impression share (rank) means you're losing auctions to competitors because your Ad Rank isn't strong enough, a signal that bids, Quality Score, or ad relevance need attention.

If you're spending £5,000 a month with a 40% impression share due to budget, you're potentially eligible for double your current volume at a similar CPA. That's money sitting inside your existing campaigns, completely untouched!

Red Flag #4: Performance Max Is Spending Without Direction

We love a PMax, it’s a really powerful campaign type that will do the heavy lifting in your account, but it can also be one of the fastest ways to burn through budget with no accountability. Without proper setup it defaults to spending heavily on your warmest, cheapest audiences - existing customers and branded searches - people who were going to buy anyway - while reporting back inflated ROAS that looks impressive and means very little.

The most common structural failures are asset groups not segmented by product or audience, audience signals too broad to guide the algorithm (or no audience signals), location settings set to ‘interest’, and no separation between brand and non-brand traffic. The result is a campaign that leans towards brand, remarketing and flatters your numbers without driving real new customer growth.

The risk isn't that PMax doesn't work, it's that it's very easy for it to work in a way that flatters your numbers without driving real business growth. 

Red Flag #5: Your Campaign Structure Is Leaking Budget

This is less dramatic than broken tracking but equally costly over time. Campaigns targeting overlapping keywords and competing against each other in the same auction, driving up your own CPCs. Broad match keywords without negative keyword coverage pulling in irrelevant traffic that will never convert. Budget distributed by habit rather than performance.

None of these are single catastrophic failures. They're dozens of small leaks that together add up to a significant percentage of wasted spend every month. At £2–3k per month, it's an inefficiency. At £5k or more, it becomes a serious problem.

Pull your Search Terms report for the last 90 days and look at what's actually triggering your ads. If irrelevant searches are regularly spending real budget, your structure needs urgent attention.

Red Flag #6: You've Been Following Google's Advice

This one is uncomfortable to say, but we see the consequences regularly. Google reps call with good intentions - but quality varies enormously, and many are working from a formulaic playbook designed to increase your spend, not necessarily improve your returns. 

Raise budgets. Broaden targeting. Enable this new campaign type, switch on the ‘auto apply’ settings. These aren't always wrong recommendations, the problem is what gets left out - the counterbalancing optimisations that need to happen alongside them to stop the changes becoming expensive mistakes.

The in-account recommendations tab works the same way. That Optimisation Score isn't a measure of account performance, it's a measure of how closely your settings align with Google's preferences, which unsurprisingly tend to involve spending more. Accepting recommendations without question to chase a higher score is one of the most reliable ways to bump your costs while performance stays flat.

If your account has a history of rep-led changes with no clear record of what was changed, why, and what happened to performance afterwards, you may be paying for decisions that were made for Google's benefit, not yours.

How to Know If Your Account Has These Problems

The easiest way? Get an audit.

A proper audit will review your conversion tracking and data quality, analyse your campaign structure and goals, audit your product feed and Merchant Center setup, calculate your true ROAS - not the inflated platform numbers - identify exactly where budget is going and where it's being wasted, and assess the impact of any rep-led or auto-applied changes on your account performance.

We’ll say it again, small inefficiencies at £2–3k per month might stay hidden, but at £5k or more, they become really expensive. The real issue isn't that these problems are hard to fix, it's that they're invisible until someone looks.

Our audits include a short pre-audit discovery call, a written report covering everything we find, and a follow-up call to discuss what to do next. No jargon, no obligation.

Book a 15 minute call to discuss your Google Ads Audit today.