There has been an official response from Medway and it is as I had assumed. The total score is correct and the EW score is incorrect:
Medway Council says the total score and assessment published in Medway Test result letters are correct for all candidates.
It comes after concerns from some parents that some may have been sent the wrong scores.
A Medway Council spokesman said: "The total score and assessment outcomes published in Medway Test result letters is correct for all candidates, despite a publication error which led to the wrong extended writing score being printed in the letters to non-selective (non-grammar) pupils.
"We worked as a matter of urgency to look into the Medway Test results after a figure was incorrectly published on non-selective (non-grammar) result letters. While individual scores published for maths, verbal reasoning and extended writing papers did not add up to the total score, the total score stated and the assessment outcome in the results letter is correct.
"We have thoroughly rechecked the results and we will be re-issuing result letters today to those families affected with the correct figures, but this will not impact the total score or the assessment outcome for pupils.
"The deadline for review requests has been extended to 10am on Monday 10 October, to give parents more time to prepare in acknowledgement of any uncertainty this has caused over the weekend.
"We are sorry for the concern and confusion this may have caused parents at what is a very important time in their child's education.
"Parents who would like further clarification on their child’s results can contact their school directly."