Sorry I haven't checked this thread in the past few days.. I just got to uni.
The AVS error is nothing to worry about. It's just an address check, and if it says AVS error then your order went through fine.
I haven't updated any of the order statuses on the site, but rest assured everyone (unless I missed 1 or 2 out) has been refunded.
Regarding the missing money.. I'm really not sure about this. I spoke to Stripe multiple times before I started the GB and they assured me every time that if refunds were made then both the buyer and seller would be left with the exact same amount they began with. I'm not sure if that loss is due to currency conversion related stuff, but anyway.. I will try to contact Stripe when I get the chance but at the moment I don't have the time. I hope you understand.