Mine did the same thing when I first got him. He rearranged everything in his cage, his water dish, (spilling water everywhere) food dish (throwing all the food out) and his blanky, moving them all around the cage. I think it's... I don't know, a stress reliever thing? Or they try to get use to their new environment. My boy did that for about a week or two, then it slowly turned into him just tipping his food bowl over so that he doesn't have to get up to eat.
Long story short, I don't think its anything to worry about. Just keep putting everything back as it was, and he'll get use to his new home.
(I'm not an expert at all. I'm just speaking from experience with my boy.)