I have a Toyota RAV4 2002 4WD. The inner pads on both my rear brakes are wearing more than the outer…

I have a Toyota RAV4 2002 4WD. The inner pads on both my rear brakes are wearing more than the outer pads. Is this normal? Is it most likely the pins? Or do you recommend replacing the caliper? I think it is the orginal ones still. See picture.

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