All I get in a spinning wheel next to the button after clicked.
I'm using this on a staging site. Followed directions to the the letter. Setup FB app on dev site, and so on.
https://staging.coachmansdelight.com/your-favorite-carriage-driving-this-year/
I'm considering using this on my site with several ad-ons, but would like this core feature to work before spending the time and money on my real site.
We've just checked your website and don't find such an issue. We were able to login to your website via Facebook social login button.
Also, please check Astghik's answer in this support topic:
https://gvectors.com/forum/how-to-and-troubleshooting/cant-connect-with-facebook/#post-13764