My infinite fortresses seem to be capped at 92% resistance to negative effects. I’ve got a fortress that is fully upgraded, and in range of 4 neg voiders and one sanctuary, all 5 of which provide 23% resistance. This should be 137% resistance, but imsyeead it displays as 92%, and occasionally gets shadowed. My defensive wall, which is adjacent, gets 112%, as do many of my other nearby units. This leads me to believe that the problem is specific to that fortress.