Hi!
I believe the search results page override is not working. This only happens if there is another plugin overriding the search results already, or there is a custom query embedded into the search results page (which should not be there). In most cases it’s the custom query.
I recommend checking for other search plugins, if any is active, as well as removing any custom queries from the search page, so that the plugin can override the main query.
If you want me to check on that, you can add temporary FTP details, and I will look up the theme files to see if there is anything strange there.