I'm trying to understand why my injury never went back to normal size? (Photos)

I'm very sorry you got hurt. The nose is made up of bone, cartilage, and different soft tissue layers. X-rays only show what is happening with the bony part of the nose. The cartilage of the nose can separate from the bony part or the cartilage can break and crack as well. This won't show up on x-ray. You can get soft tissue swelling/bruising that can thicken the soft tissue, cause excess bone to grow, or damage and warp cartilage. All of these won't show up on basic x-rays. Its difficult to tell exactly what has happened just based on the pictures you provided alone. However, if you visit with a rhinoplasty specialist, they should be able to help diagnose what is going on and offer you options for treatment. Hope this helps.

Trauma to the nose can cause a variety of issues such as a displaced or nondisplaced nasal fracture, a dislocation of one or both of the upper lateral cartilages from the nasal bones, and a deviated septum. A thorough internal examination of the nose is going to be required to make a determination about how best to proceed