Help with iTunes

I have a question about iTunes--I've been digitizing my old tapes and just converted Jekyll and Hyde. I then uploaded the folder to iTunes and started adding artwork, composer, etc. I noticed that almost right away information was changing on some of the songs--someone remotely had changed or added things like the artist's name, album name, comments. I've noticed this on other songs as well. How can this be? The only other person on my "network" is Lori who wasn't home (and wouldn't do that anyway). Is there some kind of application that automatically uploads my music to an iTunes community of some kind? I take a lot of time to make sure the information in my iTunes is the way I want it, and the last thing I want is a bunch of Jekkie-bots editing it remotely!