This is called "Blogger/blogspot Title Swapping".This will give your blog better search engine rankings. It is always good to have your main keywords(Post title) of a specific blog post at the start rather than placing your blog title at the start. This situation becomes very bad if your blog title is very long.
As usual,Login To Blogger Go To > Design > Edit HTML.
and mark the tick box "Expand Widget Templates"
Then, find (CTRL+F) this code in the template.
