I am not really sure what exactly those are, but they probably should not be there. Can you please add temporary back-end and FTP details? I would like to debug the query to see what exactly is returned. Thanks!
Thank you, that helped a lot. Those looke like registered as comments to a specific post type, not sure which one. If you disable the search in post comments, it should fix the issue: https://i.imgur.com/YjnSQyT.png