Nothing wrong with quoting the book, but if you fly the NG and the classics you knows there are quite a few more differences than you see at first glance. Some of those differences seem to be about Vref speeds, so you need to add 10kts to all speeds on the classics and only to F15 on the NG.
The main reason for the SIM behaviour was the simulator in question. That particular mechtronix simulator (Class B) is a piece of junk, doesn't use official boeing information nor parts which accounts for the wrong indication probably, more so than a failure in boeings books on an airplane wich is now in service for 15 or 16 years already.