Hello friend
It's normal, it's strange, but it happens a lot. These plants are known for forming strange leaves, mutations, etc. but everything is fine with the plant and that's what matters :)
Good luck with the grow and hugs
I had it early on with a recent plant, but it grew out of it, sadly. By 4th or 5th node it was no longer a "tri-leaf mutation" or whatever it is called.