Bulk: Time Bomb Hybrid Pepper Seeds

So, I'm growing out 20 of these Time Bomb plants and have harvested just under 2lbs of ripe, bright red, beautiful looking peppers. The only question I have is, why are these not the same round Time Bomb peppers I grew out last year? These peppers are growing into a sort of bell pepper/heart shape. I have some plants I purchased at the local nursery that are pumping out nice, rounded Time Bombs. Now, that's just a minor complaint really, because in terms of flavor and heat, these peppers really are phenomenal. Thick walled, very tasty, and spicy enough for everyone I know who likes the hot stuff. Some of them are growing larger than the largest round TB pepper I had last year and I will not hesitate to buy them again for next years crop. Whatever they crossed with to change their shape, certainly didn't effect their flavor and appeal.