It looks like the hair as you said is being effected by a specific morph without the aid of a corrective morph. If you can locate the morph on the figure which is the source of the issue. You can turn Auto Follow off for that morph by using the gear icon on the morph and unchecking Auto Follow.

Auto follow is what reshapes the attached item to fit any morph adjustments to your figure, in some cases they are left on when they should be turned off. The worst cases are with things like elf ears which drastically stretch hair.

Or alternatively show hidden morphs on the hair and check the corrective morphs that have followed on from the figure and dial it out to 0%.