I dug deeper and the problem was at my end. The computer I am using has a parental control software installed and configured to block certain websites including twitter which caused the author's site not to load all the needed assets and screwed up the page header. sorry for the inconvenience but I would have been able to figure it out quicker than this if people who down-voted my comment took the time to tell that the site is working fine for them!

I'll appreciate if you could provide a screenshot :)