Could you try clicking the LastPass extension icon in your browser, then clicking Account Options (or your email address) then clicking Advanced > Refresh sites to see if that "forces" the password change/update to show correctly? Could you also try clicking on your LastPass extension icon in your browser then clicking Account Options (or your email address, depending on your view) then Extension Preferences > Advanced in the left side menu and setting the "Poll Server for account changes (mins)" setting to something lower than 15 minutes?
I tried both, but unfortunately it doesn't work.
I don't understand why I got the pop-up that my password was changed last week, but now I don't anymore. Also Lastpass only saves the first update I do in the vault, not all the others, if I don't refresh it in between the updates..