I am guessing it had an injury or missing testicle ... years ago, one of the hunters on my dad's lease shot a buck with one side freaky (not anywhere near as big as this one by a long shot) and the other side 5 symmetric points (like a 10 point would have). Upon field dressing, found a large catcus thorn in one of the testis that appeared to have been there a long time, extremely swollen. Another one with both sides freaky was missing both testicles, looked like they had been ripped off (fence?) and had healed, but looked like an uprooted cedar stump.
that is a heck of a deer pictured!