Near every early roboport, there are these blue pluses that I'm pretty sure represent something from the logistics network, because when I remove the roboports next to them they leave a "disconnected from logistics network" symbol.
https://i.imgur.com/gbs0enc.png (the blue pluses)
https://i.imgur.com/EmoFVak.png (the missing logistics network symbols)
I also encountered the items can be duplicated glitch, where if you place x number of ghosts, then cancel them, the fake logistics chest on the character creates them and adds them back to the player's inventory. I also think this could be what's leaving behind random logistic entities but idk when or why it happens.