You are correct on this, 8.8 was indeed =SUM(G461:G464), Percentage of total age-group population.Because there is no data in column H for that group!
hang on ... I think I can see what you've done - you've gone and used column G instead of H - that comes out to 8.8 !
But that column is "Percentage of total age-group population" !?!
There was in fact only one death in week 1 in the double dose, in cell E464, so the corresponding ASR for the double dose (=SUM(H461:H464 ) is practically zero.
That made a strong case for the vaccines.
The graphs I did for you were done with the correct ranges though.