Hi, I am facing the same problem.
When I export the JSON file, the animation actually turns our way larger than the size of the images I use in the animation.
The scale was 1 when I first exported it, and I did not scale up any bone or attachment. When I export a PNG file it is actually
819 x 724 px, and I am not sure why is that.
So I try to scale down the size in pack setting, but faced this issue.
Would like to know if there is already a solution for this?