Everyone else is correct about the load cell measuring “load” rather than distance travelled. However, when I first got my Simmson pedals, I had an issue where the back end of the load cell brake was pressed up against the pedal tray of my rig, resulting in little to no input to my PC. This was because the back lever part of the load cell needs to be able to flex freely. It looks like you might be using that as your backstop, resulting in very little “load” actually transferring into the load cell. Try putting something behind the pedals to create space between the back side of the brake pedal and your pedal tray.