I tried many different things but definitively I’m unable to fix this issue, any good samaritan around?
Check the home page on mobile.
You can see a video of the bug here: Mobile bug
Simple method to check what element is responsible: delete them one by one. Delete header and menu, still scrolls? Yes. Delete more until it doesn’t anymore. Until you delete Section Web, oh, no scroll, then that’s the culprit. Try a overflow hidden on the section, does it kill the bug? it does.