Buy Now button not directing to paypal, but takes me back to our site URL

Hi

Quite recently our wp-e commerce buy now (paypal) stopped working, or at least redirects me to the wrong link.

Here is the website.

I’ve deactivated all other plug-ins and the problem doesn’t seem to be there. I’ve also updated all plug-ins today.

PayPal seems to be integrated into wp e-commerce and i can’t seem to find a place where i can change the link direction.

Any help is welcomed.

https://www.ads-software.com/plugins/wp-e-commerce/