Hello,
Right now, on your Site under the Dashboard > Theme Settings > Shop > Free Shipping Bar > you have added the Amount as 50 but there aren’t any Shipping Zones created on your Site under the Dashboard > WooCommerce > Settings > Shipping > Shipping zones.
So, according to these options settings we added a 400 Priced Product on your Site to Cart and after adding it to Cart > there was a message displaying “free shipping” that you have added under the Theme Settings for success: https://snipboard.io/Ats7oc.jpg
So, it all seems to be working fine. Please check back your Site after completely clearing the browser and server cache.
Best Regards.