[Talenn]

One thing to keep in mind is that there is a 'per other war' modifier to the AI's diplomatic routines. Basically, I believe this causes the AI to be 'friendlier' to people it meets when it is already at war with one or more other players.

Most likely, the hostile races are encountering you, declaring War etc, and then meeting others. The modifier for being at war with you is allowing the other races to get treatys with the 'hostile' race.

That would be my guess anyways.

Talenn