Mysterious cellular data usage in early morning

i noticed this problem also, in my tmobile family plan,  my data usage records show me that i used some data in the early morning, after i dig into it, I think that the recording time is actually misleading, the total data usage matches up with my iphone's cellar data usage statistics, so just the time isn't correctly, I believe tmobile's only shows summary for each day when you look into any billing periods that before your current one, if you take a look at the current billing period's data usage, there are more granular data, so I think the data is summarized but given a misleading timestamp in the historical report.