I am by no means an expert in the tests; but I do know that there are a lot of procedures to be followed, one of which MIGHT be the order thing.

The other thing is that for that subtests, children are first given a non-timed practice run, and then they get to the timed section that really will count. Hopefully the tester interrupted your child in that practice part. I would still ask how that went IF the results seem low again.