I'm going to try to keep this as simple as possible because it's quite alot.  My hopper will not pull from the chain above it if it has an active redstone torch underneath of it.  If I remove the torch it will pull from the hopper chain above it. If I direct the hopper above it directly into it it will pull even with an active redstone torch beneath it. I was under the impression that as long as ther items in hoppers inventory slots matched ones going through the hopper chain that they would be pulled regardless of redstone torch which is how sorters work? Redstone signal locks a certain block/s in the hopper and prevents it from draining entirely into the chests downstream allowing the filtering option. Further it seems odd to me that the hopper will pull under certain circumstances with active torch under but not others. Please advise/ fix if possible.