If you continue consistently to see such significant discrepancies in max wind speed then that's not normal and there's some unexplained aspect of your set-up. As it happens, I've got a similar set-up running in front of me right now and console and WLL on the wl.com Bulletin are agreeing to within 1mph. Assuming all your checks on units, datetime/tz & location settings etc are correct then best guess is that one of the receivers is picking up a signal from a different anemometer.