Station requesting items from a different network ID

[BoulderSteve]

I have two different networks on my map, one for long slow trains (network ID 1) and one for short fast ones (network ID 2), with a transfer area between them. I have one station on the fast network that always requests items from the slow network. On each involved station I have deleted the station and the combinator and replaced both, making sure to connect the combinator with the network id before connecting up to the count of items already at the station. I've turned off the dispatcher, waited until all trains were in depots and restarted. Nothing has helped so far. Anyone have any idea what I might have done wrong and what else I should do to find the issue? Thanks in advance!

[Optera]

Check your circuitry.
Install LTNM for better visualization.

[BoulderSteve]

Thanks, that helped a lot. FYI: the combinator had the correct signals, but for some reason, the station wasn't seeing them. Deleting and replacing the combinator didn't fix it. I had to delete the station and the combinator to get the signals correct.