KDE Log-in

Haia I'm very happy using KDE but I want to try Gnome , Windowmaker, Blackbox etc. I used to get the option to choose on the Log-in screen. But for some reason those options have disappeared and I only get three options and none of them are those window managers. ( and yes they are installed). Any idea what I can do to get them back? Using 8.2. -- Greetings from /bill at 169 west , 19 south. Disclaimer: Any errors in spelling, tact, or fact are transmission errors."