The "Show admin column" option is checked in the settings for a custom taxonomy, but it is not available in the Screen Options for that post type. There are two other taxonomies created with MB with that option enabled, and they work fine. How can I get this fixed?
I'm not able to reproduce that issue on my site. Other admin columns of custom taxonomies still work as well on your site so I think it might be a conflicting issue with another plugin or a block of code.
Please try to deactivate all plugins except Meta Box, MB extensions, switch to the standard theme of WordPress and recheck this issue.
You can also try to create a new taxonomy and see if it works.