2013 honda fit brake problem?

I have a 2013 honda fit. Heres what's going on.

When i'm driving forward, the left rear brake locks up SUPER easy. Doesn't matter if i'm using the foot brake or emergency brake it locks up too easy. I jacked up the car with the e brake off, and went to spin all the tires and with all brakes off, all tires spin freely, then when i pull the e brake, both rear tires won't move, just as they are supposed to. So i took of the rear left drum and the brake shoes have PLENTY of material left on them, and the brake drum is also in really good shape, same goes for all 4 brakes. I tried going in reverse and slamming on the brakes, which was supposed to adjust them or whatever, that didn't work, i tried pulling the e brake a few times while stopped and while rolling, that didn't work, brake fluid is clean and full. What could be the problem.