Problem with appearance Menus Screen



I have a problem with wordpress dashboard Menus Screen. In the back-end of above mentioned site none of the pages, custom links, categories,.. tabs are clickable.
When I try to open the options of a menu item, the page reloads and shows the drop down.
The screen options tab can't be opened. It's just add to the url ".../#screen-options-wrap"

I'm sure there's no plugin conflict test because all the other sites that have more or less the same plugin activations don't have this problem. Also I activated that theme in a different test site. There wasn't such problem in the test site. This problem is unique to this site only.

Can someone please get into this site and see what's going on? Support access is granted.