I think your helmet was a slow cure, Paul. Not only did it smell like it, but the helmet itself warped. It took a heat gun to line the seam back to epoxy it shut with the epoxy that came with the gaskets. The part that I could not fix is the part on the side that curled out and away from the lens. I couldn't heat that part without destroying the lenses.
I would simply ask ANOVOS to replace it.
Also, the rim of the helmet seems to have been trimmed out very poorly, with a jagged cut all the way around the opening. This has allowed little cracks to form around the bottom.
I know it wasn't mashed. It's resin. Had it been mashed, it would have shattered.