This has been driving me crazy.
Fixed it today.
I thought that the pedestal might be leaning, but when I spun the seat around it still leaned to the right (side of seat, not coach).
I knew at that point it was above the swivel.
Easy fix.
Two bolts, shoved a couple shims underneath.
Luckily the bolts are captive, so I didn't have to figure out how to get a wrench on the top.
BTW - this is a 2019 THOR ACE 30.3
2nd BTW – I always carry wood shims in the outdoor kitchen. They come in handy when I want to even out a grill or cook top. They also make handy kindling.