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.
Lens created more (1.10 xG against 1.03) and left with nothing.
Lens: −4.8 for the season (15 in the table). Lorient: −1.4 (12). The gap between points and xPTS is built from matches like this one.