Ultimate Time Boost!!! [Timed Practice]
I was doing the timed practice, and after answering a question correctly, it gave me a crazy time extension! I have no idea how it happened.
Browser: Firefox 25.0 OS: Fedora Linux 19
I've had this happen too, although it was a while back and I was using an external script that let me check my missed answers. I wasn't aware it had happened to anybody else; so thanks for screenshotting it.
Have you filed a ticket on the support tab on the side of your screen? If not, try to do so, and make sure to include your screen shot.
You also might want to move this to troubleshooting, so that the people on the technical end of the site can see it easier. If you need it, this post tells you how to move posts: http://www.duolingo.com/comment/1254215.
Edit: I thought I'd add, to put a screenshot in your post type "! [ alt text ] ( Image Url )" without any of the spaces (except for the one between alt and text) or quotes and it should work. This image demonstrates it: