[Outdated][Bug 1.28] Random resources in wrong slots

My factory is having an issue with incorrect materials showing up at slots, particularly in fit brakes and fit wheels:

Other slots seem to be having this issue, but less frequently. Here is a wheel at fit radiators:

The slots are aware of the random materials in their stockpiles (and do not seem to get rid of them:

I did recently adjust overhead conveyors, but several slots have items from areas they were never connected to. For example, at no point have I ever had fit arches on the same resource line as brakes and wheels, but there are arches mixed in with wheels.

I haven’t been able to reliably reproduce this issue yet. It persists through saving, loading, and game restarts.

Nothing of interest in debug/error logs. Save file is attached.
karps.xml (1.04 MB)

Thanks, something is clearly broken. I’ll look into it :frowning: