Something does not sound right there.
If you have two people a simple way is to disable the network adapter on the computer and see which light goes out on the switch.
I highly recommend that you label all the ports on the patch panel.
It's a lot of work but makes everything easier in the future especially when there is a network emergency.
A toner and probe will cut down the time it takes to find the wires. (Take a look at Fluke Networks)
I mapped and labeled all the lines. All 3 routers are in series. When I log into the correct router it displays the correct port information.
It was worth taking the time to do this and to make the correct documentation.