My FREE coupon from Iams rebate won't scan at Walmart!!

Did anyone else get this coupon yet for a free 3.5 or 4 lb bag of Iams dry cat food? I tried the pink bag and the coupon wouldn't scan. Then I went and got the orange bag, no luck. WTF!! The pictures on the bag was of the orange bag (chicken flavor) and the Natural. They only had the orange TUNA flavor and the Natural was the 8 lb. bag. The coupon only specifies weight and that it has to be Iams dry food. Is anyone else having this problem?