I made a slight modification to the item elevator outlined in this video - namely, I shifted the redstone ladder after the first block forward one block to minimize the horizontal footprint.

When the redstone ladder is oriented north/south, it works exactly like the one in the video - it's completely silent and will move all items placed in the intake to the top, with nothing remaining. However, when the ladder is oriented east/west, each dropper clicks once with the first item, and an item is left behind in every odd dropper, starting at the third dropper and continuing for the rest of the elevator.

I tested all four orientation of the elevator but only included two in these screenshots. I also tested different signal pulsers and different input/output directions, with the same result. The elevators are identical except for orientation - the one with green wool on top works, the one with red doesn't. The glazed terracotta is pointing north.

enter image description here enter image description here enter image description here enter image description here

  • 1
    It's probably because of the South-East rule
    – MBraedley
    Feb 14, 2020 at 20:30
  • @MBraedley that seems like a reasonable interpretation - this smells like a dupe Feb 14, 2020 at 20:43
  • 1
    Not a dupe. That question is from 2012, now the block update algorithm has changed. In some cases it's more intuitive, in some it's more confusing. Feb 15, 2020 at 15:04
  • 1
    It would be a lot easier to see your circuits if you didn't have shaders on
    – Johonn
    Feb 20, 2020 at 18:24

1 Answer 1


As you might expect, this is due to a bug. Sadly there is a variety of bugs with "directional" redstone and adding blocks to the mix that are affected by QC does not make it any less complicated. So I don't actually know which bug is to blame here and how exactly a workaround would work. You'll just have to experiment and see what works and what doesn't. In the meantime, you can vote for or read some related bug reports:

Some behaviours are also "locational", meaning that they can break if you just move the entire contraption one block to the side. And I've also heard about bugs that only occur in the positive or negative X/Z coordinates. But those kinds of bugs luckily got pretty rare recently.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .