Dear Krisada-san
We're sorry that we didn't understand your question before.
If you upload CSV file, the data will be registered at every 2 hours (in even numbers, JST) to the AD.
But the distribution list member will be changed simultaneously when the AD and the mail server is synchronized by FIM system in the night (JST).
Please delete the members to the distribution list by CSV upload and test if it works after tomorrow (after the FIM sync has been completed).
*Please note as well that the member updates will be effective after completion of FIM sync.
Best regards,