I think all the 3.0 Basics have glue inside their heads. I don't mean that sticky junk you find on the hair in new dolls. This glue inside has a sticky residue that seeps through the "scalp" making the hair sticky! I hate to spend so much just to reroot them when they have perfect saran hair to begin with.
Does all your Basics 3.0 dolls have glue? To check, squeeze the heads.
If the head is hard then its glued!