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.
A draw, but Lorient created more (1.98 xG against 1.09) — points dropped.
Nice: +0.9 for the season (14 in the table). Lorient: −1.4 (12). The gap between points and xPTS is built from matches like this one.