Your questions about SoFi Hong Kong are answered here

We want to ensure a fair trading environment for all members of the SoFi community. All Fractional Share Orders for a stock are executed in batch once per day. Let’s say a couple of large orders are added to that batch. These large orders could potentially have a negative impact on the execution price of your order. By capping Fractional Share Orders at a certain quantity or estimated quantity, we prevent your orders from being affected by these large Fractional Share Orders.