Drop Down Menu completely messed up (Prestashop 1.6.1.11)

[rillo balboa]

Hello.

I'm new to Prestashop. I have installed Prestashop 1.6.1.11 and I am now filling my Drop Down Menu (original Top Horizontal Menu modul) with Product Categories and Subcategories. All went fine, but the result in my drop down menu is not what I expect. It's very ugly. The Categories and Subcategories are spread all over the drop down menu and they are not lined up, neither horizontally nor vertically.

 

So it is now:

 

And so it should be:

 

 

Site: www.probit.pt/probit_online

 

I hope someone can help me.

Thanks.

Edited March 30, 2017 by rillo balboa (see edit history)