Hi, check this screenshot. Why is that showing like that ? If clicked, it opens the website with the same url. Im confused.
Sorry forgot to attach as its keeps on saying errors on this forum. Anyways here it is , https://dl.dropboxusercontent.com/u/5128006/Screen%20Shot%202013-04-10%20at%201.34.05%20PM.png
I did a search for "how to integrate twitter bootstrap in a joomla site" and located the link you are referring to and it shows fine in my browser. Maybe try clearing your cache? As to the reason why it appeared like that.. I am not too sure.