Factories can level up by producing items
Mods introducing new content into the game.
Furnaces, assembling machines, production chains.
Every time the Centrifuge levels up while doing the Korvarex enrichment. Everything waiting to be processed is deleted. I was not understanding how I wasn't gaining more Uranium until I watched this happen.
I've just confirmed this, too. Unfortunately, i will need to remove the mod to progress in the game
I think we must wait for a release since a fix seems to be out: https://github.com/renoth/factorio-factory-levels/pull/26
https://github.com/CaitSith2/factorio-factory-levels/releases/tag/0.6.1 - Temporary build based on pull/26
0.6.4 released