When installing Moodle, if you type in your database settings then press your 'Enter' key instead of clicking the 'Next' button, the page ends up going back to the "Choose database Driver" page...

It seems the reason for this is the browser always picks the first submit item for the enter button. As the 'Back' button is the first submit button, that is what is selected.
Looks like these need swapped around then some CSS trickery to put them in the right order again...