Very interesting, one wonders if there was a cup fly trap variety that somehow got into their stock, or if this is a chance mutation that occurred from TC?!
In any case, what a fun find!
I too like to peruse the VFT's stock at my local nurseries, looking for VFT's that might be different. I just picked up one that i thought had fairly large traps, that were bigger than the rest. It was from Nurseryman's Exchange, a wholesaler from California.