Quick Q Are the Mongols bugged in my game?

They seem to be very indecisive. And they dont hold provinces. Sacking and abandoning. I hold Antioch and Adana, after a Regicide mission and a brief 3 turn alliance they decided to surround Antioch and move everyone towards Adana. But they just lifted the siege after a couple of turns without ever attackig. Now they're moving south again.

Medium campaign turn 120
(slow and steady wins the race)