Happens on monthly magazines too, they are dated the following month. I guess its a way to extend the sell-by date. Readers only want the latest issue. This is a way to give the appearance of.
Exactly. I used to write for monthly magazines, and it was a mess. Especially around Christmas, where they'd skip an edition, so sometimes what came out in late November was called the January-February edition... Ming-boggling.
I did some work for a monthly publication about Amsterdam for pocket money, we had two September issues in one year, it nearly killed the company.
Why did they skip an edition around Christmas? Vacations?