The issue here is that the user's frontend from isn't showing for guests on the frontend.
Solution:
In a case like this and you have our Access plugin enabled I would suggest that you check the permissions for the form at Toolset -> Access Control-> Forms and then check for your form's permissions.
The issue here is that the user wanted to password protect their posts but only for users who are not authors of that post.
Solution:
Unfortunately this isn't possible to do as once there is a password protection on the post from wordpress then all users will need to use the password to access the post.
