Itween MoveTo delay in the beginning of the animation

I made a simple back and forth loop for an object to follow, however whenever I start the loop my character takes a strange deliberate path each time before entering the loop. It does this each time it completes the loop and goes to start the new one. Are there any parameters to change in order to fix this problem?

iTween.MoveTo (gameObject, iTween.Hash ("path", iTweenPath.GetPath("Enemy 1"), "time", 8, "loopType", "loop", "oncomplete", "Rotation", "easetype", "linear"));