Selecting subscription shows 2 buttons in Membership – bug?

I have 3 subscriptions in my site that are in order.

A)User (Free – When Register)

B)Artist(Free ugrade)

3)Premium (Paid)

A user with a free subscription when goes to the subscriptions page to upgrade to the Artist (free), the popup shows 2 buttons instead of one. (image attached)

I have 2 payment gateways set(free and paypal)