Misalignment of teeth after braces? (Photo)

My left teeth is shorter than the other side even though I wear my retainers 24/7. I went to my dentist last week and asked her if I could tighten my retainers to fix the problem. She said that my retainers can't be adjusted after braces (but she adjusted the retainers and I also complained that there's a gap between my left front tooth and lateral incisor) but I've researched that it should be tightened.I really want to know the solutions of this problem since my dentist is barely helping me.

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