Yes, it’s actually a pretty common (and frustrating) quirk of Performance Max, and it comes down to how PMax prioritizes its automated ad assembly over your uploaded assets.
1. PMax auto-generates creatives when it thinks yours aren’t “fit” for the placement
If Google’s AI predicts your headlines or descriptions might lower CTR for certain placements, it may ignore them and pull from its auto-generated assets library.
These generic lines like “Shop Now” or “Limited Offer” are Google’s “safe bets” for click-driving language, even if they weaken your brand voice.
2. Final URL expansion can override your messaging
If Final URL expansion is turned on, PMax scans your landing pages and auto-generates headlines/descriptions from page content, sometimes pushing those over your uploaded ones.
This is why your messaging might look like it’s coming from a template, not your copy.
3. Asset eligibility & serving priority
Even if your assets are approved, Google can choose not to serve them if the algorithm deems them less “relevant” for certain audiences or inventory.
PMax blends assets dynamically, and yours might get very low rotation if performance signals (click-throughs, engagement) start weak.
4. Asset Group coverage gaps
If you uploaded creatives for only certain formats (e.g., horizontal banners but no square images, short headlines but no long ones), PMax fills the gaps with automated assets.
That’s when those generic, broad-appeal headlines slip in.
How to regain more control
- Turn off Final URL expansion (if brand voice is critical).
- Upload a complete asset set for every format Google might need — square, landscape, portrait images, videos, short/long headlines, multiple descriptions.
- Use brand terms in every headline & description so even auto-assembled combinations still carry your brand identity.
- Opt out of automatically created assets in campaign settings under “Automatically created assets (text)” , but note this can limit reach.
- Monitor asset performance reports, pause or replace underperformers so your high-control assets get more rotation.