try to roll it on the ground, and make it redistrubute the material, or just add some material, like condensed foam, then take a roll of ducktape (maybe two) and tightly tape up the whole thing so the foam has nowere to go.
I have to do after that.. Even after just using it for 15 Minutes? Are all Ever Last heavy bags this bad should I look for another brand? I wouldn't mind spending a little more money if it means getting a better product.