2003 Volvo S60 Driver-side Power Window tilting when opening/closing.

Hi everyone, as stated I have a 2003 Volvo S60 where the driver side window tilts forward when rolling down/up. I mean, the back side of the window literally tilts forward (while the front is going down), and comes out of the seem along the inner wall of the window. With a little bit of wiggle/pressing i can get it to kinda go back into place but not perfectly, and as soon as I go up/down it just comes back out. I've posted a couple pictures here: http://imgur.com/a/va6EP

I haven't had a chance yet to take off the door panel to take a look given our weather the past week (snow/rain/negative degree temps) and was hoping someone else has had this happen or someone even has an idea on how this could be happening so I know what I may be getting myself into.

Thanks!