Back to shop returns 0

Hello,

I’m sorry if this is a stupid question, I’m at loss as to what I’m doing wrong…
When I check out, bpost works fine and shows me the different options as to where I want to deliver my package.

However, when I click ‘back to shop’ instead of choosing an option, bpost redirects me to ‘/wp-admin/admin-ajax.php’. this page obviously gives me a ‘0’. I have changed the ‘cancel URL’ in the bpost admin settings to whatever possible thing I could come up with, but none of them are working. I don’t even know if it is supposed to redirect to wp-admin/admin-ajax.php. My logic thinking would say it should just redirect to the checkout page.

This also happens when I continue in the bpost Iframe and select an option, add my address and click on ‘continue’ (I have also changed this Confirm URL in the bpost admin). I assume it will also happens when something goes wrong (the Error URL).

Is this because of the URLs in the bpost admin? or is there something else wrong? I have read the docs over and over but there’s nothing in there that tells me what to do when stuff goes wrong.

Thanks for your help!

P.s.: I don’t know if this is relevant, but I use WooCommerce 2.3.10 at the moment

https://wordpress.org/plugins/bpost-shipping/