Thank you for the screenshot. The Refine Search text is not available by default in WooCommerce. It is possible this option is coming from your Theme or a plugin.
If you switch your theme temporarily to Storefront theme, do you still see this? If no, this is coming from your theme. Like that you can also test for the plugins by deactivating it temporarily and test one at a time.
You can check the following support document to understand how to troubleshoot your site without affecting your live site:
https://docs.woocommerce.com/document/troubleshooting-using-health-check/
Once you are able to locate the source of this text, you can reach out to the respective developers for further assistance.
You can also check the following support document to understand how to translate or change a string. You can ofcourse choose to translate English to English ?? :
https://docs.woocommerce.com/document/woocommerce-localization/#section-6
I hope that helps point you in the right direction.