one axil - two flowers

a situation that i had never seen...

I have had this happen has well. With me It appeared on the sanuanensis form of M.rekoi. I have also had what appeared to be 2 flowers come from the same flower tube giving the appearance of a cristate flower.

cristate flower?
interessantissimo.....
can you tell me something more about cristate flowers?

I think that a flower bud is notthing more than a modified stem, and many things can affect how a stem develops. Most of the time that is normal, but occasionally, the growing point of that modified stem does something different.
That could be to divide dichotomously in a species in which this is not normally seen; or a plant can offset that normally divides dichotomously.
In other genera, multiple flowers per areole (since the areole and axil and a single unit) are pretty normal. It happens in Myrtillocactus, and also Weingartia, two very different genera.
But I think that for dichotomous division to happen with flowers is even more unusual, but nonetheless a normal abnormality
I suppose the question might be why? is it because of a deficiency in tracel elemnts? or too much of something? or maybe some cilmatic issue? But I doubt if that can be answered.

in this mammillaria carnea seems the same will happen in two different axils...

today in biflower...

One of the flowers on a specimen of M. zeilmanniana that I own mutated into an offset one time. I was able to remove it and grow it on as normal.