It seems there is a second layer of hair behind the first layer of hair. This is noticeable with Wagstaff when he does the insane anim in which he Looks around nervously.
Steps to Reproduce
Play wagstaff, have sanity below 50%, look at his hair when the anim Plays.
Play wagstaff, have sanity below 50%, look at his hair when the anim Plays.
A developer has marked this issue as fixed. This means that the issue has been addressed in the current development build and will likely be in the next update.