Transmission speed

Recently, I signed in.  Got rejected for not agreeing with their records.  I knew the info was right.  I signed in again.  Rejected again.  Signed in again.  Accepted.

I verified that I did the correct info all three times.  Why rejected by mechanical devices and then accepted?  I put the event down to a matter of what I call transmission speed.  It wasn't at an unusual time, just normal business hours but I hadn't tried to use those circuits earlier.  I have found previously occurrences that seem to me as though the series of connections and actions was "unexpected", that the machinery wasn't ready.  I guess somebody arranged for me to get a short statement of rejection instead of a long blabby statement of explanation.  Maybe I am just not welcome.