There may be three reasons: 1. The net value you saw this afternoon is only the valuation made by the third-party software, because it can't grasp the actual position of the fund at 100%, so this valuation will be biased. In the evening, after the fund company's own accounting data came out, the software changed the data according to the real figures of the fund company.
2. If you see it on the fund website, the net value data at the end of the afternoon trading has not yet come out. This is yesterday's data. In the evening, the data of a new day will come out.
3. There are differences between intraday trading prices and after-hours net values of 3.LOF funds, closed-end funds and ETF funds.