Hello,
Apologies about the Inconveniences caused!
We have checked this out and this appears to be an issue only on Google Chrome. The Blinking of the Menu is due to the Form which gets Auto-Filled by Google and then focused. To fix this, simply change the type="password" to type="type_password" and then use the following JS Code at the bottom of the Page:
	jQuery(window).on('load', function(){
		$('input').each( function(){
			if( $(this).attr('type') == 'type_password' ) {
				$(this).attr('type', 'password');
			}
		});
	});
This appears to be working fine. It is not a very elegant solution but this is a Bug from the Browser.
Hope this Helps!
Let us know if we can help you with anything else or if you find any further issues.