Nothing is up with him at all. He played all the high-frag carry positions in Triumph, and on Liquid he is playing with a bunch of other star players, so he doesn't have the luxury of always being set up to make plays. He averaged a 1.35 rating against tier 2-3 teams in his star player role, and now in Liquid he's averaged a 1.11 rating over the past 6 months. That's totally reasonable.
Also, he's now playing pit on inferno which might boost his stats. Other roles might change too since Twistzz left the team now, and Grim might fill some of his roles.