Factorio Forums

If I fill two active provider chests with an item, and then give them one logistic chest, the bots will fill the logistic chest and then have a bunch of bots left flying with more to put in. This is with cargo size 4.

This also seems to happen if I switch to a buffer chest instead of a logistic chest.

Bots will always try to empty active providers (purple), even if there is no storage for the items. You should try to set things up such that items are only placed into purple chests if they can definitely be delivered somewhere.