Agree with
@Efemera that the back looks a bit tight and darting needs altering.
The waistline seems to be rising slightly at the front too.
As for the fit on the right side being different to the left, that is not unusual. We aren’t necessarily symmetric. Often we will have one shoulder or hip higher than the other which would cause problems. In that situation you would need a full front and a full back pattern instead of a half pattern.
When doing alterations, try one at a time. Each one you adjust will cause an effect elsewhere and if you do several at once you won’t know what the problem was and can create new ones.