
Meta CAPI Bug Causes Event Deduplication Issues for Advertisers
Meta advertisers using Conversions API (CAPI) are facing a deduplication bug that counts events like 'Purchase' and 'AddToCart' twice. This started around March 16, 2025, due to missing event_id values, leading to inflated metrics and attribution issues. Advertisers can check for this in Meta Events Manager and are advised to either wait for a fix or temporarily disable server-side tracking to avoid duplicate counts.