Hi Mike
Could be too much fertilizer. Neighbor planted in well rotted cotton gin leavings; beautiful plants, no beans.
I grow on a 7' trellis. Rows run North to South. The beans (rattlesnake) grow to the top of the trellis and make a crop rest a week and grow back down the trellis and make a second crop. When they are finished cut the vines at the ground and allow to dry, then you can crumble them off.
Claud