Many Rose and flower fo's in general can cause overheating. Soaping cool and chilling the mold can sometimes help. I have this with my rose where it will be soft and can weep in the middle, where it has started to gel, even with doing all the above and putting it in the freezer. What is happening is the beginning of a volcano which you could very well end up with if you insulate. Best to do if it is just a small area let it cure and extra month or two. Mine always harden up but takes longer, so my rose soap get min of 3 months cure time. If it is really bad such as caverns from seperation dump all into a crock pot or double boiler and rebatch