Here are a few things to check if you have not already.
Check the cross members to see if they were bent square when made putting a square on the top of the draw bar should show the side of the draw bar to be square up and down, if not the drawbar was bent out of square. Check the front for the same condition.
There may be a frame rail bolted to the cross members a bit lower than the other side. The frame rails can be square up and down but be lower from one side to the other and still give the machine a leaning effect. By the time the distance went from one tire across to the next tire following the frame, the lean could be real noticeable.
A slight distance off on one rail can make a lot of difference on the other side and even more from the bottom of the frame to the top of the hood and other parts sitting on the out of square frame.
Not being jigged up right on the assembly line, before the frame bolts were tightened is a good possibility here.
Check the distance from the top of the draw bar/rear plate to the top of the frame rails this distance needs to be the same on both sides, if they are not one side is off, also if you have a lean to the right the right frame rail would be higher in this case giving more space from the top of the draw bar/rear plate to the top of the frame rail on the right side as compared to the left side. It may just be a matter of squaring up the frame rails to the cross members.
If found to be out, you could loosen the bolts and square it your self or have them do it for you under the warranty under your watchful eye.
Hope you get it squared up.
Bob