My False Heart

So according to Tania's Tomatobase, Black and Red Boar tomatoes are supposed to be round, but most of my BRB fruit are heart-shaped. I thought it might be because of the cooler conditions when the fruit first formed, but even the smaller, newer fruit that formed during the warmer July weather have a heart shape.

 Heart-shaped fruit on Black and Red Boar 

 More heart-shaped fruit on Black and Red Boar

Even the newer fruit are heart-shaped

It's not just in my garden, though, since there's a whole discussion on the Tomatoville forum on "Pointy tomatoes that shouldn't be pointy!?!"