Blown MFC? Another head scratcher

Hey guys, so I just picked up the truck puller 3 motor 7.2v and a 4:1 aux trans reducer for my king hauler. Things went very smoothly installing and what not, but some strange happen. It appears that the motor has somehow "reversed" itself. What I mean is when I stick left to enter first gear, the motor spins at its highest output, while when I Stick right to enter 3rd gear, the motor spins at its lowest rpm, which is completely opposite from what it should be. I check the motor and trans on another KH and it works as it should, left being slowest, right being fastest. What happened here? Has the MFU malfunctioned? I'm dumbfounded. I tested the stock Tamiya motor and no difference. Anyone ever had this happen before?