Help with comparator and Hopper (Minecraft Java edition)

I'm trying to follow the tutorial here:

Here's my set-up.

My hopper at the back that's supposed to move the 1 item around refuses to do so for some reason.

Any help would be appreciated, thanks!

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1 Answer

The bottom comparators are facing in opposite direction than they should. They are supposed to read the lower hoppers (with the 'two sticks' side, through the block) and power the blocks underneath the torches (with the 'pointy' side).

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