I recently reinstalled my sparco seats using sparco sliders. Long story short, I've been having a lot of fitment problems with the brackets so I decided to disassemble everything and reistall the seats.
The problem I'm having now is the seat bottom will tip up and down as if the seat is not bolted down but upon closer inspection I noticed that it's the slider itself that is loose. All of the bolts are tightened and the sliders were not loose like this before I reinstalled the seats.
Any idea what could have an effect on the sliders being this way?

The top part of the slider(shown in red) tips up and down. The blue part doesn't move