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That sounds most unusual and quite irksome.
Does it ever let you enter complete (long, > 6-letter) passwords? and actually log in ?
A question: Did it work OK with passwords before this, if so, how recently did the problem start?
Can you log in to your Windows computer (or is it an Apple?) when you restart? I presume so, you say you restarted. (I guess your Windows login password ***** ***** 6 characters long?)
So I presume the problem is in Web pages, or similarly, not 'everywhere' ?
If so, what web browser are you using, is it Internet Explorer, or Firefox, Safari, etc. ?