You are both right.
Something like "Epic Loot" adds this extra double cheese thing to this game i wanted if you know what i mean.
I have just a few minor mods and Epic Loot. Like "Trash item" or "Recycle" to not interfere too much with the game coding itself..

So i tried the mods just a minute ago and the problem was "CraftingwithContainer". With this mod u can work at the station and it picks automatically the ressources out of the container in range..

So with 3 out of 4 mods the smelter works like it should and i'm happy ^^