Main menu isn't saved.

Hey,

im using the theme for over a year and im very satisfied with it. But as my site is growing up i now have some problems with the menu.

If add a new page to my standard header menu and save, it loses the new added sites and also the checkbox for “Position in Theme” is then unchecked.

if i set the chekbox again, the position in theme is correct, but the new sites are not added.

UPDATE: if i add a new site to a submenu it loses the checkbox for “Position in Theme”. But the new sites are saved. If i set the checkbox again the menu is fine.

But if want to add a new site as the last menu item it has the problem i described above.

Seems i can’t add more than my current 8 Main Menu Items. I need one more (No. 9)

Can you figure out what could be the problem?

my site: http://www.clashofclans-world.com

thx, Chris