Correct, the Redbook standards do not permit more then 1 session. Bluebook (Enhanced CD) permits 2 sessions, nothing permits 3.
The only Audio CDs that use 3 sessions that I am aware of are Key2Audio by Sony. It's a 1st gen passive protection.
Either try AnyDVD and remove the bogus sessions OR if you can see the gap on the CD use the old felt tip marker trick. If you have a Plextor (my fav) use Plex tools for "single session" only.
Like all passive crap it works on some drives and not on others so maybe finding the right drive.