For some reason, my mixers decided to stop making stainless steel dust (iron dust x6, chromium dust, manganese dust, nickel dust) and instead make invar (iron dust x2, nickel dust) and leave the manganese and chromium aside.

The recipe is correct, and I used an AE2 pattern provider to automate the process. The bug still happens if I manually add the component inside the mixer.

Didn't read properly, you need to use rei lock to avoid the incorrect recipe