tgd on "[Plugin: WooCommerce - excelling eCommerce] PayPal redirecting users to wrong URL"

I'm using the latest version of WC, with the latest version of WP. I am testing WC with the PayPal Sandbox. The only issue I'm having is when the user finishes a purchase and is being redirected back to my site, they are sent to a page with an incorrect address and this message:
Not Found
The requested URL /ca/cgi-bin/http://shop.mywebsite.ca/checkout/order-received/896?key=wc_order_53b6c07c7db90&utm_nooverride=1
was not found on this server.
When I manually enter "http://shop.mywebsite.ca/checkout/order-received/896?key=wc_order_53b6c07c7db90&utm_nooverride=1" the page displays as it should. (please note, shop.mywebsite.ca does not exist - the name has been changed).
Why is WooCommerce or PayPal adding the '/ca/cgi-bin/' to the head of the URL? And how can it be removed? Any help would be greatly appreciated, as the authors don't seem to be very helpful with support.

https://wordpress.org/plugins/woocommerce/