I suspect ANY of the new parts myself. Some caliper seals are directional, maybe the installer bungled it and thats why they are retracting 1/8" when you lift off the brake. I didn't think the mopar single piston units were that way but its been a decades since I have rebuilt a pair. Maybe the Advance Auto caliper rebuilder is using kits from China!
Time permitting the easy thing to do is swap them off my Duster, known good units.
Has to be hoses or calipers. While the pads look funky they do look like there were starting to shape themselves flat and the odd pedal was still there when I substituted blocks of steel for the pads.
