I'm assuming you are right-handed?
You probably are going to feel more comfortable with the right side of your body because of that, but I do definately see you placing more emphasis on the right side.
I took a few English lessons last winter, and the instructor commented that I position my left leg shorter than my right. (I myself never noticed anything). My left leg isn't shorter, but I was just holding it that way. I was also MUCH more comfortable traveling in the direction of right, than left. She showed me a bunch of stretches to do in the saddle, to help even up my body. And of course, practice practice practice. If your horse has a bad direction, you practice more on that side. So if the rider has a bad direction, practice more on that side!
It could be a chiro thing; it might not. It might just be how you've "gotten used" to holding your body over time because you are more comfy with that right side.
Good point about the saddle, and good point about the horse! Either of those could be crooked too.
∞•*˚ Βгįťţαňγ ˚*•∞
It is not enough to know how to ride; one must know how to fall.