On todays ride i was going counter clockwise for the first time which was interesting.
I noticed that the large arch tree (that comes just after the log cabin that plays some banjo music) root was floating on the right hand side, as where the three or four wooden posts.
Also i had alot of vanishing riders and riders going off circuit or round in circles, but i think that is likely to have something to do with a weak wi-fi signal i had today.
I saw the same thing yesterday. In addition, the shadows on the big tree, the log cabin and several other structures seem to move relative to my position, and not remain stationary as they should.
I just recently switched to clockwise and yeah, the entire left side of the tree is floating off the ground. Maybe those climbing feather power-ups are harvested from this tree.