Your GA4 and Meta Ads Manager will never show the same numbers. That's not a bug.
GA4 uses last-click attribution with a 30-day window. Meta uses view-through + click attribution with a 7-day default. They're measuring different things.
The real question isn't why don't they match
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Hey! Reintroducing myself for 2026:
I’m Omar, an Analytics Specialist fixing the "broken plumbing" of digital ads.
I help $1M+ brands recover lost data using Server-Side GTM & Meta CAPI. If your Meta Ads report more sales than your bank account, I find out why. 😌
Outside of the...