The problem was that BlockUI was putting top percentage by default:
Try this:
$(document).ready(function() {
$.blockUI({
message: $('div.growlUI'),
fadeIn: 700,
fadeOut: 700,
timeout: 20000,
showOverlay: false,
centerY: false,
css: {
right: 0,
bottom: 0,
left: '',
top: ''
}
});
});