Found out that this is caused my installing MCC Sandbox which enables Zeus in every mission.

Thanks. I've beaten the campaign before, but after I restored my computer for other reasons I lost all of my progress so I am trying to beat the campaign for a second time. Wish me luck.

I am and was using community mods. Right now I am using AGM, RHS: Escalation, TPW Mods, Shacktack mods, Speed of Sound and a few more. I have tried disabling all mods and this still happens.