Hello Ronny

Issues like this are usually caused by setting a non-integer, non-auto-increment, non-primary column to be the ID column for editing.

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.

You're welcome Ronny

Glad I could help.

If you have any further questions or issues, please feel free to open a new ticket, and we'll gladly help.

Best regards.

Hello Nikhil

You aren't able to add any header that includes "<" because of a security measure wpDataTables and WordPress implement. So, the title of the column is the cause of this due to the fact that "<" is an opening HTML script tag, and it's automatically being flagged as a potential SQL injection threat, so it's causing the issue.

Adding superscript to the column header is something that you'd need to do with custom HTML. This is not something we've done in the past, so we can't share any advice with you.