Factorio Forums

When commissioned massive construction job my stone brick supply got depleted and I noticed weird 'flickering' of negative number showing up in logistics system summary. Do construction robots reserve items even before they get loaded into provider chest or something like that?
It's not game-breaking but it just doesn't make sense to show 'negative count'.

This is not a bug, it means that there is more demand for the item than supply within the logistics network.

Bots always reserve their carry count regardless of how many of an item are in the network. If e.g. the carry count is 4 and there is 1 item in the network then there will be a net result of -3 until the bot actually discovers that only 1 item is available by picking it up.