Takayuki Miyoshi on "[Plugin: Contact Form 7] Captcha Field Not Responding to Size Setting"

Your theme's stylesheet has this style rule.

http://www.refugebc.com/wp-content/themes/catch-everest/style.css
Line #455

input[type=text],
input[type=email] {
	padding: 10px;
	padding: 1rem;
	width: 60%;
}

The width: 60% is applied to the captcha response field.