Oh yeah, I see this all the time, although not often with these particular races - usually, it's the Altarians, Drath, Korx, and Yor. It actually can have a pretty big impact on the game, given how much alignment affects diplomacy. The Drath had this happen to them in the Terran game I'm currently writing an AAR for, which has basically sealed their fate, as the only surviving evil race despises them and the Torians - the most powerful race in the game - are right next to them.

One game on DL actually had this happen five times: the Drath, Torians, and Iconians all turned evil - the latter two after allying with me, so it made little difference - and the Korx actually turned good and then turned evil again.