Credentials not accepted via Auto-fill

Having trouble with one particular web login… BW entries seem valid - Correct secure https URL, Username and Password appear right and those credentials are accepted if manually entered. BUT if I allow BW to fill-in the data, the webPage reports “Entry does not match info on file…” AND BW offers to “Update password?” which if accepted does not make a difference to the problem. Only thing that seems non-typical is that both UserID and Password on the webPage logon screen are NOT clear text so it is difficult to see what BW is entering on auto-fill.

Anyone have an idea of what might be occurring in this instance?