Modpack Version:
e.g. 0.1.17

Describe the bug
When taking like ingots out of the smeltery casting table they do not stack, each fills a slot in your inventory. You can click to sort and then they stack but not when clicking them off of the casting table

Expected behavior
Expected like ingots to stack

This will be addressed in the upcoming release, which revisits unification of ores, etc.

v0.2.0 has been released with an overhauled unification system that should mean automation is easier. Any items from 0.1.x versions in drawers / chests / storage will still be of the old type, but can be converted to the new unification type (if you wish) simply by holding them in your player inventory (not in a machine GUI).