The last 4 ports are combo ports, you can use the built in Copper ports or add Fiber ports in the spf+ slots, but not both.
You seem to be using C for Copper.
Ports 1 to 44 are always Copper, so there is no point in mentioning it.
This is no where mentioned in the manual, but is my best guess.
I tried to remain child-like, all I achieved was childish.