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.