Definitely weird. Then again, I'm in Cleveland where we get frosts through June 1st. I suspect that the worm castings and compost tea have something to do with this. Those are both nature's ultimate fertilizers and in combination with the sunlight and heat down in South Carolina, I don't see why this would really be an issue. Who knows, you may even be able to take one harvest from those plants, allow new bines to grow, and get a second harvest late in the Fall.