Just a quick note of support, welcome!
I would retest if I were you, your intuition is probably more reflective of what you are seeing than that quick test. We decided to test our son because we really needed to know where to start with school. I'm so glad we did and after researching and talking with the wonderful people on this forum, I suspect that our son's scores will be higher next time he is tested, if he is tested in the future.