That almost looks like an accident. I wonder if there is another state of that button (ex: turns green for "success") that's causing that behavior.
Hmm. Not sure. This is what the inspector shows for their "Get a Quote" button. That doesn't look like an accident to me. http://d.pr/i/1aPqX
Great detective work, Emily!
Accident or not, it's been messing with me for about a year!