Every once in a while this happens to me. Since I basically use the same recipe each time, I suspect it is the FO. If I add the FO at trace it is more likely to happen. I think I am not getting the FO incorporated into the mixture well enough before I pour. Sometimes I have to move quickly at this point and don't have the time to SB really well. Every time it happens, I gnash my teeth...but I just let the soap sit, uncut, on the cure rack for a few days....sure enough, the oil gets absorbed back into the fresh soap. Once it took almost a week! That is my strongest smelling soap. Made in Feb, and my whole bathroom smells like it from just a little sliver left. I must have used too much FO!!! This oil on top stuff has never happened to me with unscented soap or soap scented with EO but I have not had a lot of experience yet with EOs. Just let it be....and see if the soap sucks it back in!!