Css Apy.com Menu

Hi everybody,
i have not much knowledge about CSS but here is my problem.
I have for a few years now an Apy.com menu on my website.
When i want to put a new item in my submenu the submenu does not close nicely to my menu, with other words, the item i put in it then my submenu becomes too long.
maybe weird to explain, but maybe it is better to watch it on my website.
I don't know what i have to change in my css.

when you go to my website, then you go with your mouse to EUROPE you will see what i mean commparing with ex. NOORD AMERIKA:

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