Compilation Issue

I'm having an issue with my iTunes library where some (not all) compilations aren't listed under the "Compilations" category. I've checked the tags and they are all checked "album is a compilation of songs by various artists". It's not a pressing matter, but I try to keep my iTunes library very well organized and it's been bothering me for a while.

Also, if it matters, in the track details information I put the artist name in the "Artist" field, the song title in the "Song" field and V/A for "Album Artist" (for various artists). I don't make a habit of really filling out any of the other fields (except track numbers and disc numbers). Could something in here be causing the issue?