Wrong place for this question.
This thread is about an in game scoring presentation change made over 4 months on this specific game.
Your question is about post-game ELO calculations, which are not specific to this game.
You will want to delete this post and repost in the general discussion thread (i.e., not in the Ark Nova specific forum), and then I (or someone else) can help you understand the ELO calculations from your game (which are correct and normal based on house BGA handles things, and would be the same for every BGA game.