Mine does this too on my w201. Not sure what happened, but it's been like this for a while now. Only happens when when I am pushing it forward to close it. If I keep my hand on the switch, the rear will tilt up, it never use to do this before. So when I close it now I just push the switch forward until it shuts, then I give the switch a few smaller taps forward to get the rear to lift up and level out with the rear of the top.

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1990 190E 3.0L