This usually happens for MySQL-based tables with server-side processing turned on.

Please check if you have a complicated query with JOINs, calculated columns (for example, ” SELECT mycolumn*2 AS mycolumn2″), or some custom column aliases (e.g. “SELECT mycolumn AS ‘some/weird/name’). If this is the case, please either create a MySQL view (in PHPMyAdmin or similar MySQL DB manager) and build a wpDataTable based on this view.

From version 2.3 we implement feature that you can use multiply separate db connections for (MySQL,MSSQL and PostgreSQL) and for MySQL engine we are dynamically adding accent grave (`). If you use this accent grave (`) in your query, please remove it and searching and filtering will work fine.

You can check out the video and step by step guide on this YouTube link