Version: 26.3.461

When an Industrial Neon Furnace has enough SP and is supplied with enough (for example a stack of) Magnetite Dust, Iron ingots and Neodymium ingots, it does not use the correct recipe
Magnetite Dust + Iron Ingot + Neodymium Ingot -> 4 x Magnet Ingot

It instead combines it with the early game recipe
2 x Magnetite Dust + Iron Ingot -> Magnet Ingot

In other words, the recipe it uses is the sum of the two Magnet Ingot recipes, meaning that it effectively uses the recipe
3 x Magnetite Dust + 2 x Iron Ingot + 1 x Neodymium Ingot -> 5 x Magnet Ingot

basicly if more recipes are available all get executed, it seems like this is not always intended / good.

An easy fix would be to change one of the recipes to use Iron Dust.