I have a suspect Ghost pepper plant.
I dont think it is one but time will tell.
What I think happened is someone swapped labels with another pepper so they could get a ghost pepper for almost 1/4th the price.
If this did happen and that is how it happened that is the same kind of person that would steal toilet paper from work.
If it isn't a Ghost pepper I at least hope it is a super hot.
The leaves have continued to be a lighter color and not quite the same shape as the other plants.