Hello, not sure if this is a defect or not. But I saw the "Brutal" modifier applied in Normal mode for almost all of the Witch Queen's missions. It even warns me that my power level is insufficient in the Nav Mode screen and below the Launch button. But I was able to do a playthrough of the "Ghosts" mission without any issue and it didn't feel like it was hard to complete at all.
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I noticed the "power too low" messages on campaign missions, also. But, it doesn't say what power level is proper.