Apparently 2600 Magazine is not currently offering subscriptions. Perhaps this has something to do with what you are seeing.
Quote:
Note: Currently, Kindle Magazines doesn't support certain formats (Mac and PC) with subscriptions. However, these formats are supported when purchasing individual issues. Until this situation is resolved, 2600 is providing each individual issue here as a Kindle Book and at the Amazon-set individual issue price. We hope to see subscriptions enabled soon on these devices and will keep our readers informed every step of the way
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What does it show in Manage Your Content and Devices? Does it show back issues, and can you send them to you new Kindle?