When I melted down 4 pieces of poor bismuthinite (each 25mB) to get an ingot, I poured it into an ingot mold and ended up with 99mB inside the mold despite the crucible also saying 100mB when melted.

Also, stacked ores of the same type still only count as one item instead of all in the stack. 2 tetrahedrite (30mB of copper) melts into only 15mB of copper.

Confirmed that melting is adding up incorrectly. The other bit is that crucibles mistakenly do not limit the stacksize to 1 as they should, which will be fixed.