Showing request form not working

Hello! I have a bit of an issue with the showings request form on a typical WP Listings item – see this as an example -> https://www.copelandcompany.com/listing/1010-lake-shore-dr-202-condo-for-sale/

So on the front end when I submit a test request, I don’t know where it’s directed to. On the backend settings for the plugin, there’s a setting for “Add default form entries to IDX Broker?” I do have IDX Broker integrated, so I checked on that backend, but my test lead was not captured. I tried to “un” enable that check box, and save, and I get a successful save message from the WP Listings settings. But, nothing happens – the box is still checked.

I’m not sure what to do from here. Can you help? Thank you.
Tom