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 Espanyol created more (1.82 xG against 0.37) — points dropped.
Espanyol: −2.6 for the season (15 in the table). Sevilla: +4.7 (5). The gap between points and xPTS is built from matches like this one.