External Link/Buy This Course

Learn Press Version 2.1.6.1
I am having a problem with the External Link option. I have inserted the Paypal link: “https://www.paypal.com/webapps/hermes?token=70986033D2304514D&useraction=commit&rm=1&mfid=1495509981153_a86db5d9ac711#/checkout/login”

1) Now the “Buy This Course” link stays on the page. Even after the customer has paid and finished the course. The “Buy This Course” link still appears no “Finish Course” button or “View Certificate” button.
2) When I remove the link everything functions properly and the “Buy This Course” link goes away and the “View Certificate” Button appears.

Your assistance would be greatly appreciated.