Hello Saguaros,
thank you, I think, for me the problem is solved, although there are still strange things going on.
If I set the english and german menu with each "Home" as home in its language, (the change you made recently) the GK image slide won't slide smoothly but the image loads and suddenly jumps a little up.
Not so, if the menus won't have each it's own language.
But that's a very minor issue, but maybe could be interesting to solve.
For me, it's solved!
Everything works fine and the big white space dissappeared.
Thank you Saguaros for all your time and patience.
Kind regards
Nicolas