Five days ago I made a small batch of coffee soap using a 1 lb silicone mold, first time using this mold. To ensure it went through gel, I placed in on a thick towel which I in turn placed on a heating pad turned to high, then covered the soap with cardboard and the towel. The result is what you see in the picture: the color is lovely, i.e. just what I'd hoped for, but four of the six bars have discoloration at the bottom. I'm guessing it's related to the heat. Any input on what might have happened? Thank you.