Takayuki Miyoshi on "[Plugin: Contact Form 7] Reduce height of Input Text box"

Because you have too large padding.

http://www.audaz.com/wp-content/themes/audaz/css/style.css
Line #265

input[type="text"], textarea {
    border: 1px solid #CCCCCC;
    color: #888888;
    float: left;
    margin: 5px 0;
    padding: 4% 5% 4% 10%;
    width: 85%;
}