Playing animation on an object increases Y position

I have rigged, animated and exported from blender an object. Everything is working fine except when the animation is played the object is raised into the air. It has a nav mesh agent, and it does goto the target fine, just not on the ground. Whilst making the animation I did not effect the y-pos of the object. Oddly, the y-pos of the object in the inspector does not actually change, it just does in game. Please help! Thanks