I'm watching something quietly terrifying happen to a catalogue campaign for a high-end fashion client. A manual sales DPA ad set that was humming along beautifully - strong ROAS, CPMS in the mid-40s, premium traffic - has silently gushed over into Instagram Stories. Last week 63% of impressions were Stories. Today it's sitting at 80%. The CPM has plummeted to about $12, and the click-through rate looks dreamy on paper - over 11%. But the quality has evaporated.
Loads of link clicks, almost zero add-to-carts. The checkout numbers are there but purchases have become a ghost story. When I cross-reference Meta's reported landing page views with GA4 sessions for the same dates, the gap is staggering. Meta claims nearly 1,950 landing page views last week. GA4 recorded just over 140 sessions. That's roughly a 7% capture rate. Meanwhile, the target ROAS ad set running in parallel over the exact same window - same site, same consent settings - shows GA4 capturing about 18% of Meta's count. The only real difference? The manual ad set is the one drowning in Stories.
Yes, I know iOS and consent mode eat a chunk of GA4 visibility. But a 14-to-1 gap versus a 5-to-1 gap on the same account? That doesn't feel like normal measurement loss. It feels like a significant portion of those Stories clicks are not real humans touching the site. Audience Network was killed long ago, and it's still off.
I've seen this exact pattern before on this same account - a sudden collapse in delivery quality disguised as efficiency. Back then I panicked, relaunched, and lost two weeks of momentum. I can't stomach doing that again. The root cause seems obvious: the ad set never exited the learning phase because it'll never get enough purchases for a high AOV luxury product. Meta assumes the campaign isn't working, so it frantically searches for cheaper and cheaper impressions. And boy, does it find them - in Stories.
I'm torn between yanking Stories as a placement outright to force Meta back toward real buyers, or just killing the ad set and starting fresh. A floor on everything might prevent the drift, but that comes with its own headaches. Has anyone else watched a perfectly healthy DPA campaign for a considered-purchase brand suddenly tip into Stories and start serving up what feels like digital tumbleweeds? I'm all ears for a middle path that doesn't involve burning two weeks of data.
