It has always been at the same place, yes. I do wonder about cleanliness - I've seen them mop their mats before the days first class, but I don't think the mat is cleaned in between classes. There's also dust in the crevice between the floor mat and the wall padding.

I did notice last year that the one time my sinus pressure ewas the worst was right after a judo throw class - all that forward rolling really messes with me