Chin looks worse after implant? (Photo)

Hi, I had a chin implant over a month ago and some strange things are happening. When I smile it's noticeable and looks great but with a flat expression it's got a flat part...it's really odd. I'm told the Implat was only 5-6mm but is it possible it's too low? I can't feel it and it's almost as if it's just on my jaw, possible below? My chin is longer front on. Both photos are from left side. Just flipped for easier comparison.

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