I have exported an animation from iclone 8 to UE5 using the auto setup for unreal, All seemed fine except for the hair, at times it looked like it was not following the head correctly. After further investigation and looking at the curves it seems that iclone 8 has used some head tilt morphs as part of the animation which have not baked into the head bone making the hair not follow the head correctly.

The base animation was from Rokoko mocap data with blended face expression from digital soul (maybe that's where the tilts come from).

If I delete the expression track it removes the head tilt curves and all is well, is there away to just remove the head morphs from my animation as now the hair works but I have no expression in the character face any more.