There is a slight change in the login interface on the Moodle homepage.
Now to log in, click on the Log in button. This will take you to the login page where you will enter your login credentials.
Fig1: New login button.
Previously, you could log in directly from the homepage. The option to enter your username and password in the login form on the homepage had to be removed.
Fig 2: Old login interface - now removed.
This change was necessary due to some server-side configuration changes done to improve Moodle performance.