It's officially "not a bug" because the "they take turns" behavior is just a random side-effect of how the engine works. I can't find the forum thread right now, but here's a reddit thread where @Rseding91 (a dev) states exactly that: https://www.reddit.com/r/factorio/comme ... ...

This is my build. The red one has priority over the other 2. Wild speculation: Try pressing shift+space to pause the game and show the grid. If there's a thick black line seperating the upper right one from the other two... You're right. That's very confusing. It shouldn't work differently dependin...

I have an assembly machine with 3 output inserters. I always thought that if you have multiple inserters taking from the same source they would take turns. At least sometimes this seems to be the case. But this time I noticed one of them seems to always have priority and the other 2 have to wait unt...

Is this a bug?


Whenever I try to move the furncaces it makes a copy to that slot. Maybe related to this?

Only compatible results of a furnace are manually placeable in the result slot. (Mainly to avoid confusion of new players)