This batch of soap is tallow, lard, palm oil and castor oil, with milk from a cow and lye. If there was anything amiss with the ingredients, the problem would have shown up in all the soap, so I am convinced it was the size of the mold and overheating that caused the odd looking soap. Both, gelling and dark spots do not affect soap usage, only the cosmetic appearance of it. I will try to melt this soap down and repour it and see if the texture becomes consistent. For me, this was a first experience with both these properties, but soap is a strange thing and even when following the same favourite recipe that has never reacted, odd results can and do occur.
Otherwise, the small soap bars are perfect, uniform in texture and colour and smooth. This is cold process soap, so it will take at least 6 weeks to cure before it is usable. That is the time when the soap will slowly go through the saponification process. The half gelled bars will be heated, which will complete the process and they will be usable immediately, though all soap is best when it has time to cure and harden. When fully cured, this soap will be very hard, fit for a good shower without melting away.
Now, I hope not to have any more puzzling outcomes for a while!