Can't Choose Certain Characters

So, with the newest feature added to link characters and other things into categories, I tried that on one page, but due to the long list of characters, I can't access them in the list when it expands. Like, the names pass under the title page so I can't even pick who I actually want to insert into the page.

Could that be fixed?

Also I've tried doing it on three different browsers, so it might be a bug.

No, it has a scrollbar, it's just that part of the drop-down itself is hidden under the title of the page. I can't get to certain characters even if I scroll.