Animation leaves joints out of place

[Jack Francois]

I made a simple animation that rotates and translates the arms and shoulders, and rotates the collar joints.  The animation makes a loop.  For some people though, it leaves the shoulders slightly out of place after playing and they have to reset skeleton.  Could anyone explain what causes this and how to avoid it?  Thanks.

[Medhue Simoni]

Quote

You likely have bone translation data in the animation.