Object Constrained - Erratic Behavior

Hello,

I’m trying to make simple rope ladder animation. In the Blend file attatched (2.8), I have an empty with a copy transforms constraint. In the constraint it is assigned to a vertex group in the object Rope Ladder. If you press the play button for the animation you can see the empty rotates erratically and I’m not sure why. Any ideas or suggestions? I’m not sure if it will effect your controls but I have emulate 3 button mouse turned on in the user preferences. Rope Test_03.blend (2.8 MB)