Rotating and scaling a group of grouped objects will change the child object's position and scale.

[jamesdalby]

What's worse, undo will not fix this.

[jamesdalby]

Sorry, forgot. Adobe Animate, 2017, #16.0.0.112

[Preran]

If you think this is a bug, I suggest reporting it to the team using http://adobe.ly/1Ov9omX

[Preran]

The product team confirmed that this is a bug, and is under investigation. Stay tuned for updates.