Given the following CT script:

var ingotRefinedIron = <techreborn:ingot:19>;
mods.techreborn.alloySmelter.addRecipe(ingotRefinedIron, <ore:ingotIron>, <ore:ingotIron>, 200, 32);

Whenever I make refined iron in the alloy smelter, it ends up using two of the inputs from the first slot instead of using one ingredient from each slot, as a result it leads to some unintuitive ingredient usage as shown below:

This is possible to fix, it will require a bit of reworking how the items are used in all of the machines, so I will need to ensure that I dont break anything to badly.

Alloy smelter aimed to make alloys from two different metals. If you need to smelt same two ingots into one, please, use furnace

Yeah I’d agree with that. The alloy furnace is designed for 2 different things into one. It’s not worth the time required to fix it.