Well +5V isnt used for a whole lot in computers so it is not a huge deal, also have you checked in the bios to see if that matches up with what the software is saying. It could be very possible that the software is reading it wrong, which does happen.
Looks like MSI hasn't updated PC Alert since that exact same version shipped with the Socket A Athlon XP board that I bought so long ago that it doesn't show up in my newegg.com order history, which dates back to February 2003.
Most likely it's not reading sensors properly, based on the number of sensors it doesn't even register.
Science IS NOT TRUTH. It is an iterative process asymptotically coming ever closer to Truth, but destined never to arrive there.