There are currently two ways you can view at risk passwords and update them manually.
Password updates must be completed one at a time.
That's not what I mean. If the correct password for a site 123456 and you are using another pc and you go and look at Lastpass to check the password for that site so you can manually login for the site it shows 245689. If you open lastpass click on the wrench in lower right concern the password field is wrong. Also noted you can see the password length change when clicking on the wrench icon.
In that case, you may want to force a sync between your LastPass Vault instances across different devices by following these instructions.