dont know why this happens, but it does. what i do to fix it:
1) download 'id3-tagit 3'
2) navigate to the folder with the music with the bad tags
3) open that folder, and push ctrl-A (select all) of the songs which have the bad tags
-if you dont konw which ones they are, you might as well do all of them cuz it wont hurt.
4) after selectign the songs go to the menu on top to 'extended functions' and then to 'change tag ver. 2 text encoding'
5) make sure both of the drop down menus say ANSI coding (default)
6) click ok
7) ctrl-s to save
8) repeat for music in other folders
its kinda lengthy, but it works for me.