Grouping Glitch? Brain Glitch?

OK, for the life of me, I can't get this grouping to stop. I had grouped some drum tracks (per Kenny Gioia's Beat Detective tutorial video), finished cleaning up the drums, etc. I've suspended and activated the drums a few times, based on various tasks. I've been trying to do a simple flyover of some percussion, and, regardless of the drums being grouped/selected/ungrouped, all of the drum tracks are highlighting -- I just want ONE track. Any ideas what I'm doing wrong?