i made a new map and i testet it on my own server.
It worked fine. After that i uploaded it to a normal server.
ok it was up and i went to the server...then i startet my map ... i thought oh fine it works..

but i was wrong ....
I saw that:

but the other people this:

i tryed to jump on the objects that other guys cant see...
i laged through them

any one can help ???