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Make sure the Caps Lock light is not On, before entering the password.
Be sure to observe all distinctions between UPPER CASE letters and lower-case letters, in the password.
Be sure that you are not misreading any digit of the password ***** and esp. if it is handwritten, this can be quite a problem on occasion.
I do not recognize the reference to 'Leeper', I have to say. Is that a website, or a service, or something else?
So Keeper keeps your passwords, but its password ***** ***** refused?
Did you keep a note of the Keeper password? if so, did you post it where anyone could find it (never, ever, an idea worth any respect) ? It might perhaps have been changed, if so.
What error does Keeper give you when you enter what you think is the password?