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date sent is usual when you sent the application request.
and read should be the one when your file was opened up for processing.

just a guess though, but that is how it generally is whenever i renew my documents.
 
WardaKhoso said:
What does "date sent" and "date read " means in an online application?
It means nothing in my opinion. When you click your message. The date read updates to the time you recently clicked that message