Is new five dollar bill a misprint if it says issued in 2006 although it came out in 2008?

I checked out the US Treasury's website and found this page where you can view the front and/or back of the new bill. I pulled up the front of the new five dollar bill and zoomed in on the picture. It shows the issue date as 2006. Here's the link... Explanation Bills are dated by what's called their "series" and not by the year they're issued. The series is determined by when the current pairing of Treasury Secretary and Treasurer took office. Because Secretary Paulson was appointed in 2006, that's the series date. When a new Treasurer is appointed the date is kept but a letter is put after the date, e.g. there are 2004-A $10 bills. When a new Secretary takes office, a new series starts.