Happ has 2.2 WAR and Nico is at 1.4, my back of the napkin math says that's slightly below what their contract says they're worth for the year, with a month and a half of baseball left to play.
They're not great players. And it would be nice if both made a little less. But they're both pretty good players, they just look worse because of how they accumulate their value (Happ isn't a HR hitter, runs extremely hot and cold, Nico has no power to speak of) and because the rest of the lineup has struggled outside of Seiya being fairly consistent