I got a spring retainer 2 1/2 years ago but have noticed my upper right canine has shifted? How do I fix this? (photos)

I got a spring retainer 2 1/2 years ago. Presently, I have worn the spring retainer every night but I have noticed that my right upper canine has shifted. I am very frustrated because my orthodontist assured me that if I wear this retainer every night my teeth will not move and assume the shape they were with my mold. I am making an appointment, but wanted to ask you if my situation could potentially be an easy fix? I appreciate your time, if you need more info please let me know.

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