Dependent Index/Match Struggles

Hi all,

I'm having a bit of an issue with an INDEX/MATCH formula that should be fairly straightforward, however, something doesn't seem to be working.

Essentially, I've made a reference table with a several rows which feeds into a much more concise calculated table (a scoring table).

I've populated the reference table with an age group, and the raw scores and percentiles that correspond to that particular age group (as students in different age brackets will obtain a different percentile based on their raw score).

So in that summary table, I would simply enter the age bracket, the raw score, and that table would return the percentile that corresponds to that raw score/age. However, one of the percentiles is returning as an incorrect value.

I've attached a sample workbook to clarify the issue, any help would greatly be appreciated!

Darko