It appears RGIII is shell shocked.
http://profootballtalk.nbcsports.com/2016/06/17/robert-griffin-iii-looked-shaky-in-browns-practices/Robert Griffin III may still be the favorite to win the Browns’ quarterback competition, but he hasn’t earned the job yet. And in the Browns’ offseason program, he didn’t inspire a lot of confidence that he’s going to be a great player in coach Hue Jackson’s offense.
According to Pat McManamon of ESPN, in the six practices open to the media, Griffin had as many bad throws as good ones, passes that were tipped, intercepted or should have been intercepted