Sorting for custom field not working

Hi there – many thanks for creating your plugin.

On our site, we run a Membership programme (based on Memberpress) which allows creating custom fields for customers. The custom fields have a slug each and I can add a new column with your plugin using the slug of such a custom field just fine.

What doesn’t work, though, is the sorting feature. When I try to sort by the new column, the backend seems to re-sort the users table alphabetically based on the usernames but not on the content of the custom field (which is a simple text field).

Any idea why sorting doesn’t work in this case?