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 Paris FC created more (1.55 xG against 0.34) — points dropped.
Troyes: +0.1 for the season (16 in the table). Paris FC: −0.1 (3). The gap between points and xPTS is built from matches like this one.