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I'm having a strange problem with a redstone circuit in Minecraft- can anyone help?

Thought I'd build a cannon since most old ones don't work anymore, and encountered the weirdest redstone glitch where, for some reason, a line of redstone will not power even though it should, and once I break it and put it together again, it does. It's baffling me. I'd appreciate help.

apples!!!!! (author) 5 years ago
Well, I accidentally blew the circuit up and had to redo it, only to run into the same problem...I fixed it by making the redstone go down a block on the left an not on the right. Nothing, in terms of the wiring, actually changed, but it now fully works. Silly Minecraft!