Because the fund price you saw at that time was the net value of 10. The fund purchased on the same day is calculated according to the net value of the day, and the net value of the day will not be calculated until the close of the day!

Yours is "purchase cost", plus purchase fee. I calculated for you, and your subscription rate is 1. 25%, compared with the general subscription fee 1. 5% is cheaper. Does your bank have a subscription discount?