Problem with dropdown Menu

Hello

I have posted new problems on thread:

forum.joomlack.fr/index.php/4-maximenu-c...g-second-menue#10320

I would be glad to know how I couild fix it and what experiences you have with the different brownsers. It seems to be a browser issue. I only know so far that it is a problem with Safari on the iPad but I think also other browsers might have the same problem.
Would the problem be fixed on Safari using the mobile addin?

THanks for any help.

Manfred