I can’t make heads or tails of what’s going on through the UI, but this much I’m sure of:
Khan class dreadnought:
1: Placing 4 powered resist modules and 2 heavy plates lists 13.64 resist if the top slot on the nose is clear. Presumably this is slot 0?
2: Moving one of the heavy plates to the nose of the craft changes the value to 18.46 resist.
I have recently witnessed some craft resisting things far beyond what appears to be possible in the editor. It’s possible the actual armor value does not reflect (yes, pun intended) either of these UI values.