If you log off hurriedly while editing XI objects or if you lose network connection, the locks corresponding to the objects are left hangling. When you log back in, you will not be allowed until the lock is removed. If you contact Basis team to get these locks removed, you should know that you can do it for yourselves. Non-admins can remove the locks that are set on their name. Therefore you can remove lock on the XI object that only you were editing.
To unlock call http://<host>:<port>/rep/support/public/LockAdminService