They can actually grow like that. Antlers can be imperfect as anything else that has cells that grow. You don't see imperfect antlers as often because imperfect ones are a disadvantage in the game of life for them.

There's also a typical deer antler scoring guideline for hunting that has a point system. Certain imperfections drop your score like drop tines or a spread less than 13 inches(which actually disqualifies you from scoring).

As for the photo, I'm sure it's been altered but it's not as far-fetched as you'd think.

Also, if you take a photo of a set of large antlers from below, they do go into a kind of misshapen heart. Not quit as rounded off as this photo, because they typically go straight out at the ends. But I'd imagine you could get a photo of a heart shaped set of antlers naturally with position of the photo and the right combo of imperfections.