need second opinion -tipping?

[modulo]

Hello, I started to put in my 10th set of trays tonight and something bothered me. I had 1 bicuspid extraction at the beginning of my treatment.. I think that that the back teeth are beginning to tip into the extraction site. Prior to this the back teeth didn't look much different when I was on tray 8 and were already at that angle. My doctor also said it was ok and within spec. Can someone please advise? Thanks!