Hello @Lina Scott
Thank you for the post.
We are sorry for the inconvenience with the password changing. If the password of an item is changing to the master password temporarily, this is a known issue. The reason for this happening is that LastPass data was inadvertently saved to your browser's bult-in password manager. Check that list and remove any erroneous LastPass entries to avoid the conflict.
Thank you,
Karol | Customer Care