DS6 took WJ-III at 5.3 (K at that time) and he too ended up with weird Broad Reading Score. It was weird enough for us to e-mail the psychologist about it even before Dottie mentioned the same thing

He wasn't given one of the written tests so he was lucking and official total achievement score. His fluency subtests were lower than the others. He had brief achievement a fluency scores.
Kriston, no impostor syndrome

Your son so belongs there. Some days I keep thinking that we were really lucky DS6 cleared the 150 requirement for WPPSI. What was difference between getting in and not? 2 or 3 questions? Definitely not much.
There is a difference between the new and old numbers. I remember comparing DS6 numbers to crisc's son's before her son's test was renormed. It was a huge point drop but if you look at it as %, the difference was tiny. KWIM?