My 2016 36FK did the same thing. I thought maybe it was adjustments on the air bags in the back, so I took it into Freightliner. They said they couldn't get it perfectly level with the air bags, but that this was common on this chassis and that they have a shim kit they put in the drivers side front leaf spring to fix it. I had them do that and that fixed it for me. Now the coach is level and it was covered under warranty I believe.
You should take your coach to Freightliner, they should be able to fix you up.
Perry and Bernadette
2016 Seneca 36FK
2005 Jeep Liberty toad
2012 Rans Seavo Tandem Bicycle