It's not mutation, this are moss that are growing in different conditions.

The 1st batch is probably not receiving enough light so it grows stringy. That is causing stress to the moss.

The 2nd batch why it's tips are burnt. There has to be more causes for it to have that condition. Is it experiencing hotter temperatures? Causing some stress?

The last batch is growing in open air in flooded conditions, something sphagnum moss normally encounter in nature.

I've been noticing some of the shpagnum mot moss onto of my p plants soil is turning kinda green, is that mold, and is that bad? Should i take it off of my plants soil or will it not harm my plants?

As of today I have dumped every other method of growing sphagnum, except for setup 3.

Flooded outside direct light works best for my conditions.

@KittieKAT

If the sphagnum you're using is the dried dead stuff, it's most likely just algae. I don't think sphagnum can mold.