Same Plant - But Different???

I was inspecting my crop of Hylocereus seedlings and I noticed this - Most have four radial divisions, a few had three, but one had five. And while I was at it, I was checking on my Selenicereus testudo and on the same individual plant, there were segments with four, five and six radial divisions. It'll be interesting to track these plants as they grow older to see if the trait continues...