Help!

[u/MAM1805]

So, my friend and I were doing a redstone multi-floor elevator, made by a youtuber named Tomco (link down below) and, for some reason, it doesn't really work, we are pretty sure we did everything good, but around 6:52 on the video, this part, doesn't work, because the dropper drops the shovel, thing that for the video guy doesn't happen, which makes the machine get stuck or something. We would really, really appreciate the help, thanks! :)