A division reverting in another form?

[SOS]

Today I was making a bunch of Epi. porpax divisions out of a bunch of overgrown 2" pots. These plants had been in pots for about two years maybe. Before that they were part of a large sphere, back when the genus was Neoporpax.

Upon putting these into 4" baskets, I noticed one was an alba. Weird! The leaves even displayed that alba characteristic being devoid of anthocyanins. I know that Epi porpax var. alba exists, but these were divisions off the same plant. Is it possible that it reverted to that form in the course of 2 years? Between fungicides, fertilizers, pesticides could there be something that could cause that to happen? The other option would be that a seed pod developed, and the seed developed into a blooming sized plant. Option number three, genetics changed with a new growth?