Glitch in mobile menu?

Using Catch Everest (free version at the moment) I've found the responsive mobile drop-down menu tends to revert to the menu item at bottom of list, so eg. on my site I select 'Literature' (3rd on my menu) then when page loads the menu displays 'Contact' (last on my list). Is this a glitch or have I done something wrong? My site is: olleydesign.com Password: bog I am using Chrome on a Mac.