Minecraft ATM Machine Not Working?

I tried to make an ATM in Minecraft using this tutorial:

tinyurl.com/y9b3ybhv

I know that I did everything right; It was working until I placed redstone during 24:25 until 25:38. The redstone, redstone torches, and redstone comparators/repeaters were somehow powered, though they shouldn't have been powered. I tried removing the redstone torch that was close to them, but to no avail. It was still powered. I tried digging down a few blocks and checking whether something underneath was powering it, but nothing was.

When I tested it out, the papers got stuck in the hopper. Can someone help me get it to work?

I play Minecraft on a Windows 10 computer. It's updated to the latest version.

Actually, I figured out what was the problem. There was a little bit of redstone in the dispenser next to it, which was powering it. Never mind.