My DS, who is now 8, was the same way at 4. We didn't test him until he was 7, and then we were testing him primarily for autism, not for IQ. His IQ scores weren't anything to write home about, but I think this kind of behavior may have played into it. Also, he seems to have been trying to force the IQ test questions into the mold of what he was currently learning in school, which led to him getting a number of them wrong.
I can't tell you whether it's normal for a neurotypical child (since he does have autism), but no professional has really commented on this aspect of his personality, unless you count teachers saying that he is fun to have in class.