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?
I will ask my collegue if he knows more how to help you out! Let me know if the link above helped or not! 🙂