If you have the Wet Okole seat covers, it makes it even worse because the hole becomes even deeper. When I took the rear seat off to install the Wet Okole seat cover, I had to zip tie the 2 buckles on the passenger side together at the bottom (where the fabric cable meets the buckle) so that they support each other because one will help hold the other up. That works pretty good.
The single buckle on the passenger side, I don't have anything to zip tie it to because it's there all by itself, so I just make a loopy zip tie around it, so that if it gets pushed down, you can grab the zip tie loop to pull it back up. This works for a while but now this zip tie loop broke off on one end, but still usable until the other end broke off. I guess somebody was too heavy handed in yanking it up. Maybe instead of using zip ties, some sort of rope would be more durable.
I was easy for me to do the zip tying because I had the seat off. Taking the bottom seat off is not too hard, but putting it back on may be a bit more tricky.