It loks like the interior quarter panels have pulled away from the door posts on both sides leaving a 1 inch gap between the panels and the door posts (jam).
Is this common and is it caused by interior heat over the years? I am attempting to restore my 1988 Fiero Formula and this seems to be the only interior trim issue I have come up with.

The rear B pillar panels do have a gap between the edge and the weather strip, but it's not a full inch. There should be a screw near the top of the door just above the latch that holds the trim panel securely in the door jamb.

You can see the screw fierofool mentioned in these pics form the web. I haven't seen the hard plastic Fiero interior panels warp from heat over the years.

[This message has been edited by 2.5 (edited 10-23-2017).]