^ agreed
I took the picture and tried to line it up as best as possible and it's probably the camera angle, but it looks like the entire u tab caster angles might be not right. I wouldnt read too much into my picture, but thats one of the things you need to rule out Look at how one bolt is visible, and the other just barely.
You could also use the tile lines on your floor as straight edges to see if the tires are acting out of whack, or if one tire is mounted further back than the other, especially as you go through the turning motions.
