Sometimes when I tag a song with a genre and/or add it to one of my collections, and then refresh the page, it undoes those actions. If I re-add it to my collection, it shows up twice in that collection. This is only a minor annoyance, but I just want to put it out there in case anyone else is experiencing this, and to see if it can be fixed.
This has been happening a lot more lately, particularly after I edit or add a new section to a TheoryTab.