Dear Support,
If you click Duplicate under "All Meta Boxes" it does not Duplicate the selected meta box. It will only open a "Add New" metabox without all the Duplicated information.
MB User Meta, Meta Box, MB Builder, MB Columns, MB Include Exclude, and Meta Box Updater.
Now, when I click on the the Meta Boxes and then click on "All Meta Boxes" It will show all the published meta boxes.
I hover over the one I created until Duplicate shows up, which then I press. It will only open a "Add New" window, without any of the original information.