On my page https://slevas.lt I tried to write a comment under one of my posts. I used FB login function, but the avatar wasn't loaded. It also didn't appear once I published the comment.
Please navigate to Dashboard > wpDiscuz > Settings > General Settings tab, click on "Purge All Avatar Caches" button, then check again.
Also, make sure you don't have the plugins that may cause the issue.
In case you want to say thank you! 🙂 We'd really appreciate if you leave a good review on the plugin page. This is the best way to say thank you to this project and the support team.