Hello @yumeko,
My name is Henry and I am happy to assist with your inquiry, and appreciate you contacting LastPass Support!
I am sorry about the issues you are having with your shared passwords. Please ask the other person to revoke the share and share it again. Have them make sure that they are able to log in on their side with those credentials and troubleshoot both accounts if it still is not showing the correct details on your side.
Please let me know if this worked or if further assistance is required.
Thank you,
Henry | Customer Care