help with headliner/ E320

RE: 97 E320 headliner:
I wonder if this is normal, and if so, how did they design this one!
When looking through the rear window of the car, you can not only see a gap
in-between the headliner and the car roof, you can also see the light from the overhead rear passenger light as well, including some the inside parts!
It does not seem to be sagging, it seems to be missing something to either hold it up or conceal it across the top.
Anyone see this before, thanks!

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