I was playing with the Port numbers and discovered the physical printed number on the port does not match the GUI port number presented through LuCi on the switch page.
LuCi shows LAN1 which is physically numbered 4.
LAN2 is physically numbered 1
LAN3 is physically numbered 2
LAN4 is physically numbered 3
I would imagine this is leading to a lot of pain for some users trying to mirror port traffic!