Can't Remove pages from Menu

Hi,

I keep trying to edit my menus. I have tried moving them to the right place and saving, they move back to where they were. I have tried using the move up/down, under whatever buttons, and then save, they move back to where they were.

I tried to delete some pages from menu, after press save changes they move back to where they were. After i tried to ad new page in theme menu section, page appears in menu bar but not showing in the site its self, and i cannot delete it any more, so its now showing two same pages in wordpress menu bar, but not in site it self. I tried to make new menu, after that the site shows whit out navigation menu. It's driving me mad.

I tried to deactivate all plugins. No help.