In the browser console, I it says “Loading Discussion”, then “Error Embedding” with this in the JavaScript console:
Failed to execute 'postMessage' on 'DOMWindow': The target origin provided ('https://community.bigsmall.io') does not match the recipient window's origin ('https://bigsmall.io').
The topics are created in Discourse - I see them in the “Let’s get this discussion started” page listing topics. From the dates, the topics may have been made from the RSS feed integration.