Hi Alex, I have had a play around with it but your example unfortunately
still does not behave :(
Here is exaclty what I did to replacate the problem
Click on Accommodation
then Restraurants select Thai
click on Usefull information
then click on Restaurants
Now you will see that Thai and the submenu is already showing and has not cleared and from there it kind of gets worse.
I wonder if it has something to do with the width of the sub menu??
I look forward to hearing from you.