Sometimes the server likes to eat characters. I'm not sure why, I guess it just gets hungry.
But your character that got stuck In Fluorite, click that character and just keep trying. I've once tried thirteen times on a busy day to get my character in.
If your second character is in a downloaded map that you downloaded, there isn't really anything you can do ti retrieve it until the server is reset. So you might just have to make a copy of it and wait it out. It shouldn't take too long to get out, though.