Please check your browser's password manager or form filler for erroneously saved LastPass data. See FAQ linked below for major browser manufacturers.
Chrome:
https://support.google.com/chrome/answer/95606?hl=en&co=GENIE.Platform=Desktop#zippy=,check-your-saved-passwords
https://support.google.com/chrome/answer/142893?hl=en&co=GENIE.Platform=Desktop
Edge:
https://support.microsoft.com/en-us/microsoft-edge/save-or-forget-passwords-in-microsoft-edge-b4beecb0-f2a8-1ca0-f26f-9ec247a3f336
https://support.microsoft.com/en-us/microsoft-edge/automatically-fill-info-in-microsoft-edge-81da697c-9910-d9b8-d50a-1712d96f3db8
Firefox:
https://support.mozilla.org/en-US/kb/edit-or-delete-login-firefox-password-manager
https://support.mozilla.org/en-US/kb/control-whether-firefox-automatically-fills-forms
Safari:
https://support.apple.com/en-us/105115
https://support.apple.com/guide/apple-vision-pro/automatically-fill-in-forms-tana7e86fb68/visionos
It only shows the correct password for a second and them changes it.
Hello @melindamooneyhan
Thank you for posting.
Per checking the account logs, we noticed you use the web (lastpass.com) rather than the extension.
This is most likely being caused by your browser's in-built password manager. If you have stored your Master Password in your browser, please delete it, then you should no longer have this issue.
Thank you,
Karol | Customer Care