Example:
I have four independent belts going into a manufacturer. Each belt feeds just one part. no smart splitters. However, when I attache a checker, it shows an aggregate number for all items and shows all four items in a list when I look at it (E key.)
It's as if it's reading everything that is going into the manufacturer, not what's on the belt.
This is an intermittent problem, unfortunately. But I've seen it several times now. With both assemblers and manufacturers.
2.5.4