Hi rockafeller, let's check the issue🧐

Please forward this request to the Support Team: https://vikingsweb-support.plarium.com/web/en/problems/

They will surely assist you🙏

recommendation followed, I forwarded my question to the Support Team.

Thank you

💪😎

John 2 said 

"Killing Jottun troops scores points in the three CvC categories that you specify."

Unless you ran your own sh siege and/or were otherwise attacked on a tile or town,stronghold siege does not score points in the killing warriors during an attack catagory,but i am assuming the op confused total kills with that catagory perhaps,as  john otherwise correctly stated a sh siege scores points in 3 catagories

the three catagories are 

killing enemy troops (total)

killing enemy troops in the sh

killing enemy troops during defence

What a stupid rule.  Has nothing to do with the genuine battle...