@danlik
First , with this new site, you likely still reading off the cached version, so the usage you got was not up to date
Try to login My Account using Incognito mode (or InPrivate for Edge, Private for Safari) or try again with a completely different browser like Edge/Firefox/Chrome. You should then see the latest usage from the server
And, for the detailed history, if you filtered it too early, it might not show the details correctly, check my earlier post with the issue and workaround
https://productioncommunity.publicmobile.ca/t5/Get-Support/Usage-History-page-Filter-problem/td-p/84...
In short, best is to download the Excel file and filter it using Excel instead