Sorting group Order in Layer not working correctly. Objects are overlaying each other incorrectly.
This is probably related to a known issue in the Unity Playworks Plugin engine.
Possible solution:
Disable and then re-enable the gameobject with the sorting group in a single frame. Once this is done, the sorting group layer should then work correctly.
void Start()
{
gameObjectWithSortingGroup.SetActive(false);
gameObjectWithSortingGroup.SetActive(true);
}