The Good News is you will probably never make that mistake again!
That's a sign that it never fully saponified. If you Hot Processed it you needed to cook it longer.
That's possible with NaOH soap but you would use 6-8 times the weight of soap. In any case, the result is like
@AliOop described. It will indeed revert to solid soap given enough time. (Speaking from first-hand experience! )
I reckon that's an initial reaction that won't last. The batch is seriously NaOH heavy and rear it's ugly head as
@DeeAnna mentioned.
Nope.
Nope. Not at that level of excess NaOH.
Fully saponified soap (NaOH or KOH) requires no preservative.
It will keep if you make an adjustment to compensate for the excess NaOH.
So sorry you went to all that trouble before checking in here.
The only way to correct a batch with excess NaOH mistakenly subbed for KOH is to add enough fatty acids/oils to use up the excess NaOH.
For the benefit of those who may be interested, I'll explain what to do to correct the mistakes.