Brake issue

[Locke888]

Yesterday my niece says her front driver side tire is making a scratchy sound. I’m thinking brakes. She brings it over and I take off the tire and sure enough the brakes need changed. I head to auto zone and grab some pads. I change out the driver side, they were extremely thin. I go to change the passenger side and find that they had like 70% life left!?
I’ve never seen this before. Why is one side wearing out so bad and the other not?

 

[Locke888]

Welp after some research I’m thinking the guide pins are stuck. Never had to mess with them before. Hope they come out easy. I’ll have to work on this tomorrow.