Problem with Question List Page link

Hi
In settings of Question List Page I chose the right page that I want to show Questions List then I went to Menus and added menu item in my main menu for the same page.
when I click on the menu item in my website it goes to homepage not to Questions List Page.

if I make new page and change the settings to the new page it works for many times then the problem comes again.

Please I need help to fix that.
by the way I don’t have any problem in Ask Question Page.

thanks.