Not to be annoying, but did you forget to activate the script? Because that's the easiest explanation I think.

If you did activate the script then as you know Pahlava, Hayasdan, Pontus, and Baktria should all break alliances with the AS at the end of the first turn, I don't think there's really any way around it because I believe it's scripted (unless one of those factions is the player). I guess it's possible that they made peace and reformed their alliances? But with RTW AI...... seems unlikely that that happened to me. I don't know, I feel like this has something to do with the script either malfunctioning or not being activated.