MetaHuman head floating in sequencer

Hi, I am working in a shortfilm with 5 metahumans (each one in a room)… I found for the second time that one of the metahumans has the head not following the body inside the cinematics (only this character, other metahumans work fine).
The first time it was solved just restarting (it happened with another metahuman)… But this time is taking too long. I can even drag the same metahuman BP into the scene and assign animations and the head behaves fine…
Any clue? I guess this should be happening to lots of people