I washed my Baroud mattress cover and am having a devil of a time getting it back on the mattress. I dried it on cold, so I don't think I shrunk it. The mattress, of course, is a rectangle with the corners cut out and I cannot figure out if it is symmetrical or there is a specific way I need to put the cover on it. I got it in there, but it's lumpy around the edges. Anyone have any advice? Thanks!