It doesn't look like a short leg to me. Back off 20%, shove your close knee out without thinking about the other side, and see if that doesn't fix it. If it does, work it back up from there. If it doesn't, you may have to lighten up another 10% and try to focus on the hips, which is harder to do. Either way, being symmetrical in the exercise will force the strength/flexibility asymmetry to correct itself.