Animation Editor: animation dummy gets "weirded out" after playing the animation

[LucasWolschick]

After previewing an animation, the character returns to an invalid position and modifies the entire animation.

Steps to reproduce:

1. Open up an empty place in ROBLOX Studio
2. Create a normal dummy and load it into animation editor
3. Make ANY animation that involves rotation
4. Click "Play"
5. When it returns, notice the positions changed. Play still plays the original animation, though.

Note: In the gif, the issue is not so evident but in larger and more complex animations it is.