I think you have a wrong ticker/name combination in your database.

What Claude AI says is correct:

Index Bloomberg ASX/IRESS

S&P/ASX 20 AS26 XTL

S&P/ASX 50 AS31 XFL

S&P/ASX 100 AS25 XTO

S&P/ASX 200 AS51 XJO

S&P/ASX 300 AS52 XKO

S&P/ASX MidCap 50 AS34 XMD

S&P/ASX Small Ords AS38 XSO

All Ordinaries AS30 XAO

What you show:

AS31 No Securities Found, XFL No Securities Found

AS51 ASX 200, XJO No Securities Found

AS52 ASX 50, XKO No Securities Found

YET,

your closing price for AS52/ASX50 of 8,484.10

is the correct closing price to the S&P/ASX 50 (XFL).

The ASX 300 (XKO): Closed at 8,641.00 .