Problem:
Bottom layer on biggest furnace.
Can't place 4 ores on either end, unless I really angle my character.
Ore: Tungsten
Maybe someone shall have this same issue, I'll try to replicate this for Thursday when I have more time. For now I'll post it to see where this issue leads. Maybe it's a one-time thing, or it's tungsten related. Shall figure this out later, I timed out for the night.