Breast implants move when working out and simple in my left breast?

I had a BA last August and have been lifting heavy weights. I have 480 cc high profile silicon mentor implants. I never specifiy lift chest. When I'm working upper body like tricep dips for example I notice my breasts moving and today I noticed a indent in my left breast in the inside area where my cleavage would be when I drop down for a tricep dips. Is this normal? Should I see my surgeon?

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