I can’t really detailt it any further, I only have the chance to connect Facebook when I want to do an Instagram widget but my business doesn’t have any.
I’ve checked your widget and see that you’ve successfully added the hashtag and profile sources through the Public connection. Thus, the posts have been collected and the widget is working fine now:
With the Public connection (you’re currently using) only 60 latest posts can be pulled for each source.
If you want to display all posts without any limits, you can switch the connection to Business. For this, your Instagram account should be linked with the Facebook business page.