Baron..I crashed under 5mph in a parking lot..My head hit directly on the curb. The helmet had a crack about 2 inches long all the way through... That could have been my head.
One thought..Don't helmet instruction sheet say once crashed, a helmet might be weakened internally? Not sure we believe that..?
In case. - Many helmets manufacturers will allow a return at cost and postage, should you agree-there might be a problem...
At the time, I had a Bell and they replaced it..