Qlik Community uses an SSO system and does not store a password in your local system. If your browser is supplying a password that is cached locally by the browsers password management system.
Try deleting any Qlik Community password stored in your browsers password management system.
If you still have you're original email from Qlik there's a link for resetting your password. I was having the same issue before I used the link. Havn't had a problem since!
• If you would like to change your password, go to https://login.qlik.com/editAccount.aspx after you log in.