Buffs consuming 2x as much, while producing normal output

[Shakkara]

When I use the 2-hour buff on my buildings, they consume 2x as much resources, but give normal output.

I just buffed an iron smelter and a coinage building. I had 20 gold ingots, after a while, 13 gold ingots are consumed, but I only recieve 6 coins.
The same with my iron smelter, every batch now consumes double the iron ore, but the ingot output is normal.

Help?

[ConTroll]

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