Following its iOS 14 update in 2021, Facebook Ads can’t aggregate results for campaigns with multiple conversion windows.
As a result, scorecards in Looker Studio (formerly Data Studio) won’t show correct values for these campaigns.
If you're having trouble with this type of data in your scorecards, use a table and break your data down by Campaign and Ad set. Learn more about these terms in Facebook's help center.
- Facebook Ads and iOS 14: What you need to know
- How to fix attribution setting discrepancies in Facebook Ads data
- About Facebook Ads custom conversions