Weird, i never had that bug, hope someone else will be more helpful...
If i were you, i d have a look in the cfg file, checking if there is no trace of an old setup in the file...?
look for
MaxSpeed=12500
in C:\Users\username\AppData\Local\Alt.Binz\misc\config.abz
maybe you will find 2 different maxspeed value? (blind shot, just trying to give you a trail)
btw, don't mess with the file, backup it before opening it with notepad