As we can see there is no problem on hover, but the menu is not full-width. To be able to help we need to see the problem.
Please activate Full width for the menu and provide temporary wp-admin access.
Create an account via Dashboard (Users > Add new) with administrator role http://prntscr.com/s3rc9m > provide us with username and password via the Private Content area http://prntscr.com/s5mao7 You can use any email for it.
Regards