Should my chin have a double bump with a chin implant? (photos)

It seems like you could benefit from more chin projection. The dynamic photos when smiling don't appear normal but I don't know your appearance before the surgery. In any case, I would recommend a CT of the chin to determine the position of the implant. Depending on the results, you may want to have the implant removed and consider a sliding genioplasty.

You have a 'high angle' growth pattern with an increase in the vertical height of the chin. The implant is placed high up so you have the implant 'bump' and the actual chin 'bump'. You should not use an implant in your growth pattern since the lip incompetence (lips do not touch naturally) will force the implant 'into' the bone over time. A Genioplasty to advance and shorten the chin height is the obvious answer.