The score says how it ended. xG says how it should have ended: it is the sum of the chances each shot was worth, not an opinion about the game.
The score matched the game: Krasnodar was the better side by chances too.
Krasnodar: +7.4 for the season (1 in the table). Rostov: −1.6 (12). The gap between points and xPTS is built from matches like this one.