Nevermind, I think I found out the problem. The solution though was to just log out and log back in.
This occurred when I home teleported from the dark animica mine to the Tirannwn lodestone, which apparently didn't update the lighting settings on the screen so it was still using the lighting information from the mine, which is dark.
I think this occasionally happens in the PC version where the lighting setting doesn't change when you move out of a particular area.
13-Mar-2019 23:21:12