Hi Alex,
Thanks for your attention. I'm having a similar problem. In my case, the login form module was assigned to one specific page (called "Login"), not my home page. Whenever username and/or password are incorrect, the user is notified with a warning and the form is appended again for resubmission (as expected). However, this takes places on the home page, and I would like it to remain on the login page. Per your explanation, it seems that my "Home" page is my "standard Joomla login page".
So, is there any way to change such "standard Joomla login page" and, in my case, specify that is must be my "Login" page?
Many thanks in advance!