Thanks a lot Kathryn, for taking time to have a look at it.
The issue is fixed now, it was the ‘Social Comments’ plugin that was causing the header texts to break out from the headers.
Thanks for pointing me in the right direction!
I doubt its the social plugin that’s causing the issue because, the social plugin was added after I found about the issue!
Even more surprising is the fact that this behaviour seems to inconsistent.
For example, the following two post doesn’t seem to have this issue!!