2008 XJ8

My sunroof works, as in opens and closes just fine, but when it is closed there is this issue. If I pull back the screen and push up on the sunroof glass when it is closed,
the passenger side is solid and does not move up. However, the driver side pushes up 1/8 to 1/4".

I discovered the issue after I recently got the car and driving at high speed on the highway. I heard this odd intermittent rattle, click type noise. Turns out the wind/pressure was causing the
driver side portion of the glass to pop up and down randomly and make this noise.

I don't know what the mechanism looks like or how it works, but the closed "locking" mechanism must be broken somehow.

Any suggestions?

Thanks - Randy