I have one other box, same lot. Everything seems to be normal in that one. I'm just writing off that single round and gonna go have fun.
Did the box that had the bad round in it, show any damage? I have, occasionally, ended up with a round like that when somewhere in the shipping/delivery process, they dropped the package. The box with the bad round in it showed a crinkle where the bad round was located. (That's why I like the overpack option that some vendors offer. It provides better impact protection.)