When I use the propreator, I can increase my influence in the area used.
But the rules say that if you already had a marker in the area being used, then this marker must be moved.
Does it means that if you already have influence in the area, and if you have unused building or war cards providing influence, you must use that cards to increase your influence in that area?
It means, if you want to increase on the same area, you need to move with the cube wich is already there (if there any). But you are not restricted to increase only on that, you can do that on any area.