Your questions about SoFi Hong Kong are answered here

Your Profit and Loss figure will change according to the price movements in the pre-market and after-hours sessions. Once the after-hours session ends, we use the official closing price from the core trading session to calculate the Market Value and Profit and Loss of your holdings and show them in the SoFi Hong Kong app and on your statements (for Market Value only).

In the event that no market data is available for a particular stock in the pre-market or after-hours session, we use the latest available closing price from the core trading session to calculate the Market Value and Profit and Loss.