Hi,

Could you check again? Empty required fields will display alert one by one but not all at the same time. 

So could you send us your site url and admin account by private comment? We would like to have a check in site.

please open file application.js in folder sites\all\themes\md_make\js, delete lines from 231 to 244.

It will fix placeholder for IE9, with higher version there is placeholder by default. 

It seems that you delete wrong lines while we need to delete below code:

/ IE 9 Placeholder fix /
        $('[placeholder]').focus(function () {
            var input = $(this);
            if (input.val() == input.attr('placeholder')) {
                input.val('');
                input.removeClass('placeholder');
            }
        }).blur(function () {
            var input = $(this);
            if (input.val() == '' || input.val() == input.attr('placeholder')) {
                input.addClass('placeholder');
                input.val(input.attr('placeholder'));
            }
        }).blur();