Hi. I received your comment.
I would like to seek your understanding that I can't speak English well.
I understand that scale problem is Spine bug and you can't fix that problem.
It wasn't fixed 1.9.09 too.
If it fixed to take a long time, I think you provide down grade Spine version is better.
1.9.05 has not problem.
Thank you.
Scale is applied according to each bone's local axis.
This makes root scaling only make sense if
(a) you scale both X and Y by the same amount or
(b) all child bones are facing the same direction as the parent
There was a recent bug where the image didn't follow the axis of its parent bone's scale. I'm not sure if that was fixed already.