1991 Window seal/ chrome strip gap

[minor4326]

On my 20k-mile car I noticed a huge gap at the front of the driver's door/ window chrome strip, at the vertical (45°) seal of the front 'vent' window. The gap is 3/8“ wide !  The passenger side is tight up against the window vertical seal. The driver side rubber strip is pushed-in and prevents water from intruding, but not far enough, clearly. Both sides / end pieces are firmly in place and neither show any signs of previous movement or of being in a different location. Can someone suggest how the miss-fitted side got displaced, yet be so firmly in place. Has anyone ever experienced this, and how do I remedy the situation and reduce the gap to zero? I'd appreciate any/all help.