Dreaded Orange Spots [DOS] are dark orange spots that appear in your soap , can be all over or random spots . this is due to soft oils used in making your soap going rancid . oxidation helps it along.
this link can give you good insight to that and some other things that plague few soap makers from time to time : http://artisansoaps.blogspot.com/p/science-or-soap-gremlins.html