I recently installed phpBB on a demo board, and noticed an error when trying to post something.
The image below explains the issue. On the posting tabs, when you select a tab, only those options are supposed to appear. Here, both options appear one below each other. When clicking a tab, the tab doesn't change and the page just drops down. (In this case, posting options and poll creation both show up)
This isn't a "the code for poll creation is in the same block for post settings". I've already checked that.