Kindly try this method:
1. Remove Justlogin from bookmarks or favourites (if it was added)
2. Clear the cache and cookies (Ctrl + Shift + Delete) in the internet browser
You need to set the duration to be from 'the beginning of time', and set to clear cookies, cached data and passwords.
Kindly ensure that the first option 'Preserve Favorites website data' is unchecked, and set to clear temporary files, cookies and passwords.
3. Close the whole internet browser
4. After that is done, try logging in once more.