Problem with VLOOKUP using table name?

Hi everyone,

I'm having trouble with a tracking sheet I created for my department in school to track pupil scores.
Specifically the second sheet.
The teacher can use a dropdown box (under tracking name) to see all the pupils % scores and the residual between that and the class average.

Unfortunately it seems to not pick up the correct score.

However I have checked my formula and it is definitely pointing at the right cell.

(I have added a sample of the worksheet using fake names.)

Any help would be appreciated.