I set up 4 dispeners with a sticky piston to push a redstone block into the center of them to dispense water. 1 of the dispensers is not fully covering the same area with water that the other dispensers are covering. Why is that?
I'm pretty sure that dispenser isn't dispensing any water at all!
The water in front of it has flowed there from the other dispensers, water flows 8 blocks counting the source block, the edge in front of the faulty dispenser is 8 blocks from the left and right dispensers in picture 4 but only 4 blocks from the front dispenser.
So make sure that that dispenser is properly loaded with a water bucket and remove the buckets from the other dispensers so you can see what is happening with that one.
The Meaning of Life, the Universe, and Everything.
"What exactly are you trying to do?"
I figured that extending the edge of the platform effected the water flow. Odd. If there were dips, holes, or edges that were closer than other edges, it seemed to change the path of the water. I've got it figured out now.