This is a photo from a web site. See here: Services - Carefree Pools .Can you get a pic of the back so we can see the writing?
That is a heck of a good catch! Have you sent them a message about it? The pounds thing on the cart is weird too.This is not my system. I saw this on a web site. I was looking at the wires, testing my understanding (I am not a professional), and I thought, "that doesn't look right." My pool sub panel has the line and one end, and the load at the other, and the load then feeds the lights through a relay. I've never seen a GFCI with a line on the left and load on the right - I've only seen top/bottom.