“Enter your address to view shipping options” – address is filled in

I’m creating a website using Woocommerce and Bpost shipping plugin.
Since I installed the plugin from Bpost I’m experiencing a problem in my checkout page.

The address is filled in correctly, but I keep getting the message “Enter your address to view shipping options”. When I deactivate the plugin, the problem doesn’t occur anymore.

Did anyone else have the same problem?