text messaging details

While trying to fix my texting problem with my phone, I went to my account to view my text messaging details spreadsheet to see when and if people had been trying to text me, and I just didn't receive them. When look at it, I found that there were 3 new texts on there from the same number from different times that I never received. Yet, in the "direction" column, it said that it was received. Why do some of the texts on there just say "sent" and some of them say "received"? Especially since I know that I didn't receive some of the texts that are on there.

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