The pictures suggest (and it is always hard to be sure) that the clamping bolts in the bottom of the lift arms have loosened. The bottom of each white lift arm (that's the white verical bar in the 4th picture) must clamp onto the stub of the torsion bar TIGHTLY, and the bar and the arm must be perpendicular. In the second and third pictures, it appears that the torsion bars are exiting the lift arms at an angle.
I suggest -
Raise the shell
Pull the shell forward beyond the stop (this may be tough to do)
Get a hefty socket wrench on the 4 bolts on each lift arm, where the torsion bar enters the arm.
Tighten those 4 bolts hard
You need to correct that angle.
Sadly, if the bolts are indeed loose, the shell may have moved up or down on the torsion bar stub. This won't affect opening or closing, but will affect how the shells seal together.
One thing at a time.
Bill
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