Symbol gets larger and larger when tweening.

When adjusting the limbs (Symbols that have been connected to a parent symbol, I'm just going to refer to them as limbs haha.) from one keyframe to another and adding a tween between the two frames the software does something a little odd. The limb will move the intended way, but it will get larger and larger as it moves to the final frame, completely on its own, and I'm not quite sure why. I can always adjust the limbs back to the original size that I intended it to be at, but it's tedious and generally quite difficult to get it to the exact measurements as the limb in the previous frame.
•I've tried locking the layer, unfortunately that doesn't fix the issue either.
•I'm using the Cubic Ease In and Out, though this issue has been present with every tween style I've experimented with.
•I've mostly noticed this with limbs that are not directly attached to the parent limb. Etc: Issue is present in Lower Forearm, which is attached to Upper Forearm, which is then attached to Torso, the parent symbol.
•I'm running Adobe Animate on the latest version of MacOS, and I haven't been able to find anything else online.

If anyone has any answers, it would be greatly appreciated. Thank you.