I am using the Discount Coupon Purchase sub-module to allow for purchase of bulk coupons. In the coupon settings I have "Maximum number of redemptions (per code)" set to 1. I have verified that the coupon codes are showing up as used via the Coupon Usage Report (/admin/store/reports/coupon)

What I have tried so far:

  1. Setting all order statuses (except canceled) to weight 0 as per #8 here: http://drupal.org/node/649306

The purchases are being made by an anonymous user, but with the same billing information being added.

Related and unresolved issues (automatically closed for lack of follow up:
Maximum number of redemptions (per user): param not working when used with bulk coupon: http://drupal.org/node/1074550

I believe this is different from the redemption limit problem in the "Maximum number of redemptions (per user): " described in this issue: http://drupal.org/node/690166