Hello,
Thank you for providing the login details. Upon accessing your WordPress dashboard, I would recommend running a reindex in Relevanssi, as this can often resolve search-related issues. Please navigate to the Relevanssi settings in the dashboard, and initiate a reindex. Settings -> Relevanssi -> Indexing
After completing this step, test the search functionality again and let us know if the issue persists.
Looking forward to your update.
Best regards