Today, I was playing through the game for the third time. I was leaving Koribban (the third planet that I went to), and back on the Ebon Hawk, I talked to Kreia. She told me that we had to go to the Enclave on Dantooine. So I did, and when I got there the Enclave was rebuilt and all three masters were there. Kreia killed them, then I went straight to Telos. Mandalore never joined my party.
Has this happened to anybody else?
Thanks.