Replying to Rear leg catches and drags

Search barred, couldnt find what i wanted. When I'm hitting rails my rear leg edge catches sometimes and throws me into getting my nuts slapped back in time.. I tried fixing this by tilting my back foot onto the edge facing up the hill, which is sweet on rails that are flat, but whenever I try to do it on a down rail I just wash out. Never really had this problem before but now it makes me heeps nervous to hit urban.. Anyone has this problem and resolved it.. It just feels unco tilting my back foot, especially since it makes my stance so much narrower.