Ethernet Ports on Router

So basically I have the pace 5268ac router from you guys, and I have 3 of the Ethernet ports used. So two of them are lighting up green, and the one that I am using is glowing red. Why is this? Is red bad compared to green? Can you explain it please? Also if this helps, the port that is red is plugged into the wall while the others are directly into other things like Apple TV. I'm not sure if that has anything to do with it but I thought maybe it would help. Thank you for the help with explaining what the red means and how to fix it if it is bad.