So, spoiler warning, main quest, I've completed both the Ilinubi Caverns and Corprus Cure quests, but recently I was clearing out a dungeon and my resistance to disease effects disappeared. I know how to use the console to get the corprus back, but not the cured version. Can someone help me with this? I keep catching blight and common diseases even though my character shouldn't be and it's pretty weird. This is the first time I'm playing through the main quest so I'm not sure how to handle this.

The first time I've heard of this. Mods?