Is my tail light coming off because my exhaust?

I bought a muffler from pep boys and some piping, i cut off the stock muffler and clamped them on. I know it wasn t professional or anything. But now my tail light above the muffler is slowly coming off and the bumper is too! Any idea what i can do to stop it from coming off? Please and thank you. Its a 2012 honda accord.

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