white foam

Hello :) I made a batch of soap with 500g olive oil, 200g coconut, 150 castor oil. I used 164g KOH ( with 494g water for KOH ) my KOH has a 100% purity, and calculated with 5% superfat. It came to trace just fine and then i left it sit in oven 6 hours in residual heat and then it looked...