Board Game Arena

Is this a bug? I thought that in a 3 player game, the ELO you get should be the sum of the ELO won or lost against each of the other players.

https://imgur.com/VD9AkQe

Here's the game, but it's not the only one I've seen things not add up on:

https://boardgamearena.com/table?table=99975470

ELO rating is designed for 2 players.
It seems that scaled as 3/4 in table of 3 players to avoid over affecte.

That makes sense. THank you and thank you for the link.