Hi @mikkelpe , thank you for the explanation! 🙂
Buttonizer loads slightly later than the rest of the page. I think the event listener initializes before the Buttonizer menu is build.
Personally I do not have knowledge how the Facebook pixel works (sorry for that), do you need to set up these campaigns on the webpage itself?
In this case you may initialize those Buttonizer related scripts of the pixel after Buttonizer is initialized, this is possible via javascript and you can read more about this on the following knowledge base topic: Execute javascript after Buttonizer is initialized.
I will ask my collegue if he knows more how to help you out! Let me know if the link above helped or not! 🙂