dates confusion

See the attached file.

I just created a new email to be sent in an hour (item 1). The "date received" column shows the time corresponding roughly to the scheduled sending time. Another delayed email was submitted earlier (item 2). The scheduled sending is 11 mins before the newer email but the "date received" shows 18 mins difference. Yet another email which was scheduled to be sent in the future a few weeks ago (item 3) shows sending in 2 days but "date received" is on February 4th which is more than 2 days.

Why is there a discrepancy?

By the way, when I display the "date sent" column, I see exactly the same date and time as in the "date received" column.