Zip Code Failed Validation

ItsNemo thought this was worth mentioning said

So I was attempting to get in on this current deal at the last minute, and I got an error code to the effect of “zip code failed validation” instead of an order number, BUT I have a pending charge for $15 on my card. I figured that was weird and for some reason I tried it again, so now I have two pending charges for $15. I suppose my question is whether I should expect two foot dremels or zero foot dremels. Ideally I would like one foot dremel but Support’s away at home. Their auto-responder told me to come here, it sounds like that error just happens sometimes?