Hi!
Well, without actually seeing the issue, it is hard to tell, but let me ask you a few questions:
– Does the loader spins, before displaying the results, or nothing happens when you try to search?
– Are there any error messages in the browser error console, when reloading the page?
– Are there any error messages on the screen, or within the server error log?
– Are you using any custom code from the knowledge base or anywhere else within the functions.php file in your theme directory, that is related to the search?
– Do you use WPML or Polylang or any other multi-language environment plugins?
Please let me know.