Reach 360 certificates displaying despite being sett to 'off'

I've built 2 courses, 1 in Rise 360 and 1 in Storyline, then published to Reach 360. I have then put both courses into a learning pathway. Certificates are set to off for the 2 courses and on for completing the pathway. However on completing either of the 2 courses a certificate becomes available to download. A third certificate is available to download on completing the Pathway... is this a bug? How can i disable certificates for the courses? I've attached a screenshot showing where I have set certificate to ''off' form the course.