Opening kscreen kcm via kcmshell the vertical size of the windows is too big for the vertical resolution of my laptop screen (see attachment screen_2.jpg) It doesn't happen if you open if from system settings (it has a vertical scrollbar instead).
Created attachment 105744 [details] the bug
Created attachment 105745 [details] the windows working correctly when opened from the system settings
Thanks for the bugreport! This problem is generic to kcmshell, so pointing it to the already existing bugreport. *** This bug has been marked as a duplicate of bug 366299 ***