I've had this problem before on this particular game - Forge of Fury - which is a bought dungeon. What happens is that periodically I come to move my characters to a dungeon and discover that the Dynamic Lighting has moved one square to the left. (See the picture of the Dynamic Lighting layer below). This section (the Foundry) is the second time this has happened on this dungeon. Putting it right takes quite a considerable amount of time and effort, with no guarantee that it won't happen again. What causes this and how can I prevent it, please?