Hey there, @blumkaffee
I’ve had similar issues with pixel tracking on WordPress. A dedicated plugin can often make it easier to get the code placed correctly and fire events like “Add to Cart.”
With browsers getting stricter about tracking, I settled on setting up the Facebook Conversions API (CAPI) to get more accurate data. It sends events from your server directly to Facebook. You can find some useful information about setting up a CAPI gateway here: https://stape.io/fb-capi-gateway.
Hope this is still useful.