Membership Coupon "Used" count set on 0!

Hello WPMU Dev community,

I am using the latest version of WordPress, BuddyPress and your Membership plugin (plus a few others of yours) and I am having a big issue with the Membership coupons system.

I have got over 20 coupons for my membership site and I have tested a few of them out myself and have got other members to test them out as well (and they have worked how the should), but in my Network Admin under the "Membership > Coupons" it displays that none of the coupons have been used…

Can someone please help me sort this out? I am about to launch a website and I need to see which coupons are being used.