Check box appears over form titles

Those are not check boxes, they are your default list item markers. Please see this FAQ item: Why is my form showing up with list bullets?.

To remove them, add this to your theme's stylesheet or wherever you theme provider suggests adding custom CSS code:

[css]
body .gform_wrapper form .gform_body ul,
body .gform_wrapper form .gform_body ul li {
	list-style-type: none !important;
	list-style-image: none !important;
	list-style: none !important;
	background-image: none !important;
	background: none !important;
	padding: 0 !important;
	margin: 0 !important;
	border: none !important
}

That CSS when added to your stylesheet worked for me. Right now, when I look at your site, I don't see the custom.css being output. Is there a configuration option to ensure it is output? Or, can you add the CSS to another stylesheet? It needs to be output somewhere so that it can be applied and get rid of those list markers.

Here is a screenshot of when I apply it locally: http://minus.com/lzAG24xwi5gmg

Can you post the link to the custom.css file which contains the CSS I provided from the FAQ? With the attach.php adding the stylesheets, I can't easily see the stylesheet or if the changes were made to it.

The code will work for any Gravity Form, in the sidebar widget or in the post body.