
28/03/2025
Meta advertisers using the Conversions API (CAPI) face a technical problem called a deduplication bug. This issue started around March 16, 2025, and is causing key events like ๐ฃ๐๐ฟ๐ฐ๐ต๐ฎ๐๐ฒ, ๐๐ฑ๐ฑ๐ง๐ผ๐๐ฎ๐ฟ๐, and ๐ฃ๐ฎ๐ด๐ฒ๐ฉ๐ถ๐ฒ๐ to be counted twice. ๐
Events are recorded once by the Meta Pixel (browser-side) and again by the server-side CAPI because of missing event_id values. These values are crucial for correctly matching browser and server events. ๐
๐ฃ๐ฟ๐ผ๐ฏ๐น๐ฒ๐บ๐ ๐ณ๐ผ๐ฟ ๐๐ฑ๐๐ฒ๐ฟ๐๐ถ๐๐ฒ๐ฟ๐ -
๐ง๐ต๐ฒ ๐ฏ๐๐ด ๐ถ๐ ๐ฐ๐ฎ๐๐๐ถ๐ป๐ด:
โข Inflated metrics: Events are counted twice, making campaign data look incorrect.
โข Attribution issues: Meta struggles to track where conversions come from.
โข ROI analysis difficulties: Conversion tracking is unreliable.
๐๐ผ๐ ๐๐ผ ๐๐ต๐ฒ๐ฐ๐ธ ๐ฎ๐ป๐ฑ ๐๐ถ๐
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Advertisers can check if they are affected by opening Meta Events Manager and reviewing reports starting March 16. Meta suggests two temporary solutions.
1. Wait for a fix: Meta is working on solving the issue.
2. Disable server-side tracking: Use only browser-side tracking until the bug is fixed.
This issue is on Meta's side, and a resolution is expected soon.