There is the gnarly (I don't quite understand the explanations) subject of placing the spool the correct way on the pin. So far I haven't come to a definitive conclusion on this but sometimes it's very much the case of therad twisting and tangling as comes of the spool. My solution has bee a transverse spool holder (clip on sort of thing), it has improved a bit since then. Yours seem sto be exactly the oposite, threads untwisting?