On all four wheels the inboard side of the brake calipers are not worn at all only the outboard side of the caliper is being used
All 4 wheels need the caliper slides cleaned out and lubricated. I assure you that the inboard pads ARE being worn. If they were not, the car would not stop at all because that’s how sliding calipers work.
The sticking slides are keeping your outer pads in contact with the rotor and wearing them at a greater rate than the inboard pads.