With the significant lag time on Kristal AI, what prices am I actually buying at?

Placed an order on 21Aug and got an email confirmation that Kristal send out with the Excel file indicating the purchased qty and Unit NAV at USD47.40 and to-date this is what's still being reflected on Kristal . Can someone enlighten me why is that my portfolio showed my purchased Unit NAV at USD49.61 when it never exceeded USD48.440 for the last 7 days?

It will be market order, refer to below for the exact details of the execution. This is from Kristal AI.

1. At every 20th minute, i.e an hourly basis 24x7 00:20, 01:20, 02:20 ….all approved trades are pushed into a trade queue.
2. Checks for the exchange trading hours is done and the relevant trades are routed to the relevant exchange with requisite pre-checks on real-time basis. Mandatory gap of 10 seconds is maintained between 2 trades requests.
3. Trades which cannot be executed because the exchange is closed are re-sent into the trade queue.
4. At the opening of the exchange, trades are not pushed for 45 minutes to allow for stability of the market from the usual opening volatility.