Perhaps the bolt holes on the metal base of the seat are slotted to allow some adjustment for square? I would loosen them up a bit and see if the seat will re-position correctly.
If not, and there is no better means to straighten it available, then judicial use of a die grinder with a metal burr to the holes in the seat base should correct things. However, on a 2016 I would task Thor to warranty it first.
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