Broken links – Front page and Menu

Hi,
In my front page there are 3 pages.
They all used to work just fine.
But, suddenly the one in the middle stoped working. When I hit it, it stayes in my home page. Same thing happen when I hit the link from the menu.
However when u load the page directly using this:
http://www.easy-chemistry.co.il/שאלות-ותשובות/
U get thr right page.
So, the page do exsist, but the links are broken.