Bent passenger back window

[Belize]

While fixing the back awning bracket on my 2006 Ford E350 SMB, I notice that my back passenger side window was slightly bent. When the window is fully closed, the front portion remains open about 1/4” to 1/2”. During driving in rain this will definitely allow water in.

Any suggestions on how to adjust this? I’ve tried lubrication and bending the brackets, but don’t want to mess it up further if there is an easy adjustment for this. Thanks!