The coupons can be redeemed as many times as you wish, even if you have set the limit of 1 :(
Here is the solution:
Add this line in system/tastyigniter/models/Orders_model.php line number 638
[php]$this->db->set('status', '1');[/php]
https://github.com/tastyigniter/TastyIgniter/commit/c6e12d00785abd77e9d50d0be524b29ca2db45fa
Regards...
