An antler clubbed like that usually means an injury of some kind. I was told years ago that if a deer has an issue on it's left side, the right antler will be affected and
vice versa. I've been paying attention to a number of deer over the past several years and have found it can carry over into following years if the injury is severe
enough. By no means an expert of any kind, but enjoy observing anomalies in deer via the game cameras. Some of them have interesting traits.