Don't change anything. This is a system wide glitch while they were
incorporating these new item specific categories. eBay said it could
take 12-48 hours to get eBay standard delivery operational again.
With the postal rates going up on January 24th I wouldn't be surprised
if it goes live that day so they can add it into the system at the same
time they make pricing adjustments.
Until eBay fixes the problem, click help & contact link at the top. Type
in seller hub. Go to the first option "Seller Hub" and click the
highlighted link for seller hub and it will take you back till they fix
the "Home" button which is messed up.