Welcome!
If these scores are really accurate for Matrix Reasoning, you might want to know that that number is not in the Average range (as listed); it's more like Very Low, and would indeed make one concerned about possible learning disabilities. The intra-index discrepancies that I would examine closer are those in FR and PS, especially FR. VS is not really significant.
My first question, though, would be if there is any reason to doubt the validity of any of these scores: e.g., if your child is very young, and unfamiliar with testing, or was not feeling well/not well-rested/etc. on that day. If your child is age six or seven, you might consider having the psych re-administer Matrix Reasoning using the WPPSI-IV, just to see if it was an artifact (or in case he did not understand the task the first time around).
If sustained attention/impulse control are concerns, they could have affected any of the lower scores.
Another area to check would be perceptual-motor skills, since two of the relatively lower scores are visual-motor involved (BD, Cd).
And more importantly, do you see any evidence of learning challenges or unexpected delays in development IRL, or general unhappiness or frustration with school?
