Welcome!
I have the same issue with the WJ III scores. Similar pattern to yours
DD tested at 4.11
Broad Reading: 134
LW-ID: 161
Reading Flu: 142
Passage Comp: 140
Brief Reading: 172
I am still perplexed. I have asked everyone who will listen (haha) and the best answer I came up with - thanks aeh - is when the test was normed there must not have been a very large sample size of children in the EG/PG range and therefore the funky score.
I had the tester double check the numbers and she insisted they were put in correctly.