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Yeah, I think it's some kind of glitch in the email. When I veiw it in outlook (where I manage all my emails), the rate shows that 22.49%, but if I view it in a web browser it actually scrolls down to 3.99%. It's still funny though because that card already has an active offer of 0% through November 2018.
So, I assign half of the blame to Citi's IT department for not being able to send an email that works properly and half to their marketing department for sending offers to someone who already accepted a prior better offer.