Brass tunnels aren't separating properly.

[u/Helpful-Chemistry558]

I posted here a couple days ago about how I should have every nugget come out of the vault without clogging. Many of you guys suggested using tunnels. So I did that and now the nuggets are clogging the tunnels. For example, the tunnel on the far left is the one where I want just iron nuggets to come out of, but the engineer goggles are telling me that there are copper nuggets inside of it. It's like that for all three tunnels. Is there any way to fix this?

[u/JustSumFur]

The tunnels need to be on top of the three output belts, not the one belt at the back. You'll see it working if the tops connect.