The reports looked great. The tracking under them was broken, and nobody had checked. Every budget call was being made on numbers that weren't real.
Found across US Google Ads accounts I work on: equipment dealers, home services and professional services.
I found it and flagged it. Nobody had noticed, because on paper it looked like a win.
None of this shows up in a normal report review. The reports look fine. You only catch it by checking what each number is actually counting. That's the first thing I do on any new account, before touching strategy.
Send me access and I'll tell you what your reports are quietly getting wrong.