Hello Colin

I used your file to create a table by importing it and it created a table with around 25 columns.

You have an empty column header for the second column, so that needs to be changed in order for the plugin to generate the table normally.

Other than that - I cannot say why the table is not generating more than 12 columns.

Please provide me a temporary WP-admin login for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course we do not provide login data to third party. You can write credentials here just check Private Reply so nobody can see them except us.