Comment on WordPress Site Title Tag SEO 2016 by Mark.
That is when ‘best SEO title’ is ‘off’ then only the post name is displayed.
Please check this in the SERPs for example as I think it is the opposite of what you way. For example, Your 45 year old millionaire website displays the Blog title on every search result.
I think you have Best SEO title ON here but it displays this anyway. You have to turn it off to get only Post title not Post title + Blog title.