On rare occasion the named scorpion doesn't spawn so you only get 1. That is pretty rare though.
There is another I farmed with a guy many, many moons ago when I was a wee nooblet in my first fest. Hopped in ran quick to a chest popped and recalled. Can't remember what that was I barely knew the game at the time. Might just be rose colored glasses but seemed I got a ton of stuff in a hurry.