@coco I think there is a hair that has been enabled incorrectly. I don't know how to fix it but I think you need S3PE to change a setting in the code used to make the hair. Since I've never looked at that type of code I'd be clueless as to how to fix it. But it should be fixable.
I did have floating hair once but I think my problem was bad cc that I finally got rid of by using the 50/50 method. It took a really long long time to find it. But that hair looked great on my toddler. It was causing other glitches in the game though, and the main one was when I couldn't open the save any more. Fortunately I use Save As so I was able to go back to an earlier save and test if it was the hair and putting it on a toddler and saving made the save unable to be opened again. That's when I knew I had it and removed it and there were no more issues.