I guess they never fixed the parking brakes in subsequent years. I have a 2006 and had issues with them since I got my Jeep 8 years ago. I finally had enough in the fall (seemed only one engaged which didn't do diddly). I bought a rebuild kit and took off the one I heard grinding or not engaging at all (depending on its mood). It was so corroded, dust and chunks of rusted metal came out and the hardware was pretty seized. Then before I took it apart, I realized it was together backwards (the springs and the adjuster)! I have no idea if someone tried fixing it before and did it wrong or Jeep put it in backwards from the get-go. Either way, it pushed the shoes into the insides of the drum on my disc and burned it all off. There was plenty of evidence of high heat on the metal that the other side did not have. Replaced the shoes and all the hardware, lubed it up and was all good. The other side had no wear on the shoes (I measured) after 12 years so I left them alone. I should adjust them again, but they work fine now.
But the rubbing on the backing plate was something I had too with the parking brake. It still does it from time to time so I don't engage it anymore. When I engage it, sometimes it gets stuck on the driver side and rubs ever so slightly on the rotor. Could be a similar problem with yours as mine with a rivet holding on the backing plate rotted away and when you engage and disengage the parking brake, it shifts (the parking brake and the backing plate are mounted together). My solution is pumping the parking brake a few times (stopped of course). For me, it puts it back where it needs to be and doesn't rub. Or don't use the parking brake unless you need to
Those backing plates are cheap thin metal and they have a tendency to rot. Also, the small rivets holding it on are not the greatest. Only fix is taking off the axle and replacing the backing plate in my case.