So not sure if this is a bug or some really rare glitch but have had a few mutations on DNA mods that don't match with the specific group. First one I thought was an error on my part, like I just forgot that it was part of that specific group, but when I did another run I got a solus mutation on a Prism DNA mod.
PC Specs: Intel(R) Core(TM) i5-7300HQ @ 2.5GHz, RAM 16 GB, Windows 10 Home Version 21H1 OS Build 19043.1415