In /wp-content/plugins/speakout/css/signaturelist.css at about line 38 you will find
.dk-speakout-signaturelist-name,.dk-speakout-signaturelist-city,.dk-speakout-signaturelist-state,.dk-speakout-signaturelist-country {text-transform: capitalize;}
which is capitalizing the text of the name, city, state and country.
To stop that, add the following to your theme custom CSS
.dk-speakout-signaturelist-name { text-transform: none !important; }
This will stop the name being capitalized.