I don't think I've seen this addressed, but when I see people referencing Alerts on today or a date I always think it's important to note (in case it's not known) that Alert dates are seldom action dates.
it seems you're referencing myFIO alerts. TU always being the latest Alert through myFICO for me and many; days, to weeks to no report for a month possibly. Alerts dates seldom identifies the day the change occurred or even when (not balance as of date) the lender actually reported the balance as of to the CB.
If you know your report dates and/or use something like Credit Karma, WalletHub,etc that can confirm the report date, it shows there is pretty much an absolute "report a balance as of this date" for most cards, but:
When the CB reports it to the credit monitoring service is one question;
When the credit monitoring service pulls/grabs that data and then when they report it to you is another question.
I see updates on WalletHub which is a daily TU update regardless of the score model long before myFICO sends me a TU Alert for the same balance change seen before on WalletHub. Same with Experian which I have a subscription that also provides daily updates and myFICO is later. So it happened, but each credit monitoring service sent me an alert and provided an update for the same action/information change on different dates.
Alert dates can't tell you when something happened. It's just letting you know something happened in the past.
If you know all of this, sorry for the long post 
