WebPlus X6: secret - opening the page

Hi,
I have a strange behaviour on one of my projects.

This is the index.
https://dl.dropboxusercontent.com/u/...Wev/index.html
Every link from menu opens at the top of the page except this one,
https://dl.dropboxusercontent.com/u/...ev/besede.html
this opens at the bottom. I tried to explore, what is the reason for such behaviour, but no success. Can anyone help. please. It is not a big problem, but I am very very curious what is the reason for such behaviour :D

On the menu this page is called Besede, if you want to see from the index.

Thanks!