Hi Kristen
Do we have issue with image banner as seen on this (http://dev5.khtestsite.com/) website? If yes, then issue is the uploaded image, which is itself pixelated. Check here – http://dev5.khtestsite.com/wp-content/uploads/2015/07/stock-photo-32972452-successful-businessman-with-his-arms-wide-openA.jpg
Ideal banner image size is – 1280 X 550 as seen here – http://demo.simpleprothemes.com/flex/personal/