Thanks for all the help Bilka, I think I got it working now

Yep, I found this: if data.raw.module["effectivity-module-4"] then bobmods.lib.recipe.replace_ingredient("energy-shield-mk4-equipment", "effectivity-module-3", "effectivity-module-4") bobmods.lib.recipe.replace_ingredient("fusion-reactor-equipment-2"...

Thank you, I will check there and see what I can do.

mod.cfg [item-name] productivity-module-4=Productivity Module 4 productivity-module-5=Productivity Module 5 productivity-module-6=Productivity Module 6 efficiency-module-4=Efficiency Module 4 efficiency-module-5=Efficiency Module 5 efficiency-module-6=Efficiency Module 6 speed-module-4=Speed Module ...

I'm making the modules as new items in a separate mod I'm making for myself, I've changed nothing in Bobs mods or any others.
They work fine though, I've added the recipes and technologies myself as well.

Hey all, In the last few days I've gotten into Factorio modding, but I've hit a weird issue. For a test mod I've made a few new modules, including 3 new tiers of the basic ones. For some odd reason, some of BobsEquipment recipes containing modules like the Fusion Reactor mk2-3-4 and others have some...