Indeed it looks funny to have no fields at all in layout mode and still see fields in table view browse mode.
Just in case this helps anyone, if you create a list layout and leave it as default, i.e. you don't use the field picker to add the fields to the layout and subsequently delete a field you get the 'Field Missing' header.
Thankfully 'Modify Table' does allow you to remove this from the table and then completely disappears from the list of fields.
The same thing freaked me out in FM12, too. It's not a new thing.