WPMU Premium Membership Coupon Box is not showing up

The coupon box is not appearing when someone tries to register. We have coupons activated in the Membership plugin and we have added coupon codes but when people go to register the box does not appear so they can't input a code. I've deactivated plugins and it still doesn't show, I also updated/fixed the membership tables and still doesn't work. Can you please take a look and see if you can find the issue.

It says not to add personal details here so, if you can email me I'll supply you the log in information.

Many thanks for your help!