<p dir="auto">The preview iframe on the right of the code window shows duplicate code.<br>
<a target="_blank" rel="noopener noreferrer nofollow" href="https://cloud.githubusercontent.com/assets/169922/11039473/73866be6-86cd-11e5-960d-feba8376fd30.png"><img src="https://cloud.githubusercontent.com/assets/169922/11039473/73866be6-86cd-11e5-960d-feba8376fd30.png" alt="preview-iframe" style="max-width: 100%;"></a></p>
<p dir="auto">When I checked the source code for the iframe, I did see the code duplicated twice as well.<br>
This occurs on many, if not all challenges that I have taken so far. A refresh of the screen seems to temporarily resolve the issue at times, until I go to the next challenge. At which time, the code duplicates again.</p>
<p dir="auto">Using Firefox 41.0.1 on Linux Mint 17</p>
<p dir="auto">Challenge <a href="http://www.freecodecamp.com/challenges/waypoint-line-up-form-elements-responsively-with-bootstrap" rel="nofollow">http://www.freecodecamp.com/challenges/waypoint-line-up-form-elements-responsively-with-bootstrap</a> has an issue.</p>
<p dir="auto">I think the problem is happening on all Waypoint pages; the device right side of the screen where the CatPhotoApp page displays the information is being displayed duplicated;</p>
<p dir="auto">Another point is that the HTML / CSS code is not completely displayed when the page is loaded, it is necessary to click or edit the code so that the code from the previous lesson is displayed correctly;</p>
<p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://cloud.githubusercontent.com/assets/8672039/9483149/cbe9f67c-4b72-11e5-9b2a-698deaa06a4e.png"><img src="https://cloud.githubusercontent.com/assets/8672039/9483149/cbe9f67c-4b72-11e5-9b2a-698deaa06a4e.png" alt="duplicate" style="max-width: 100%;"></a></p>
<p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://cloud.githubusercontent.com/assets/8672039/9483184/285ff19a-4b73-11e5-8601-6c5fbb58215b.png"><img src="https://cloud.githubusercontent.com/assets/8672039/9483184/285ff19a-4b73-11e5-8601-6c5fbb58215b.png" alt="lost previous code" style="max-width: 100%;"></a></p>