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Instead of rebuilding the keychain, simply use Keychain Access to delete all occurrences of keys that are associated with that wireless router. Also remove them from the "Preferred Networks" area in System Preferences, like in your image above.
Then, re-connect to the wireless router, entering the password and clicking the "remember" checkbox. See if that helps the settings stick. I do believe that it somehow became "confused" since you mention that you tried to connect to an access point of the same name, but different password. That could very well confuse the AirPort software and the keychain.
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