The early stages of tooth movement involve correcting rotated teeth, bringing high-positioned teeth down and, in general, lining the teeth up in a single row. Patients most often seek orthodontic treatment to straighten their crooked teeth, and in the first six months these changes are the most visible, so patients are at their most satisfied. The later stages of treatment involve correcting the bite and fine, detailed alignment of the teeth. Some patients didn't even know they had a problem with their bite before they saw the orthodontist, so they may not pay much attention to its correction and may not notice the changes that are happening. Because correcting a misaligned bite takes longer than straightening crooked teeth, it may seem to you that you are wearing braces or aligners for longer than necessary, but that is not the case.
This answer is for general information. Your own case needs an examination by an orthodontist.