[Estey]

so after taking the vent off, it seems that the middle is not rising up because of a notch that catches on the vent.
I would think that a simple solution would be to place that notch evenly across the entirety of this part of the dash so as to prevent either side from rising again.
A possible solution could be gluing this part of the dash down to a thin piece of metal or plastic that attaches on the underside of the piece with a 90 degree angle that spreads across the affected area and has a notch at the end.
idk if thats an understandable explanation, but thats just my two cents. i know that someone has already used epoxy and clamped these pieces down, but this was just another way one could fix this issue

edit: not too sure if the first method is the best route to take because it may cause fitment issues with the vents, but Im not sure. Ill have to check it out again.
Also im not sure if there is a place for these notches to catch across the entirety of the vent cover. I didnt look at it too hard when i took it off but ill go back and check unless anybody else can chime in.

a much simpler way without having to fabricate anything might be to get a staple gun and staple across the assembly creating notches with the staples so that these notches would catch on the vent and keep the dash from rising up.