Oh, bloody hell. Both of these depictions annoy me, because I'm a Lovecraft purist, and I tend to stick to this depiction:

As someone who investigates card fraud/dispute situations, I see a lot of this. Duplicated transactions not uncommon, and are — believe it or not — usually the result of a tape-loading error on the part of the card-issuing bank. Yes, magnetic tape, yes, your bank's fault. Usually the merchant can't even see that…