To reproduce this:

1. Open "BasicSceneRegular" scene
2. Hit play
3. Observe that the "MinigameScoreBoxTemp" is in the centre of the scene
4. Observe that the inspector shows "0,0" and alignment is Top-Right
5. In the inspector, change anchor pos X to 1 and back to 0 again
6. Observe the box is now top right aligned
7. Observe that the sub element "Box" is now 50% off screen - the values for the rect transform have been changed from the prefab ( regression from the previous beta )
8. Stop playing and drag the "MinigameScoreBoxTemp" to the canvas, set the anchorPosition to 0,0 and observe the correct alignment/position