Case 60xt rolls when Controls are in neutral position.

[BWFab LLC]

Ive got a 2006 60xt that when im operating, decided it wants to roll in the direction of slope when machine is running and controls are in neutral position. i understand it may move slightly on a steep incline, but my machine is rolling freely on the slightest incline and makes loading trailers with material a pain. the drives feel like they are operating correctly with no excessive play in the drive chains/motors. Im new to these machines so any input or direction on what to check would be greatly apricated. Thanks