I use Webmaster Tools for my website and I have removed duplicate titles in my site. But it is not getting reflected in Webmaster Tools.
Is there any reload to view the changes in HTML Improvements?
No there is not, Google will reflect the changes when it crawls and processes your pages again.
This whole process may take from days to weeks and you can't force Google to do it right away. Even if those conflicts are already solved, they could still be showing up in Webmaster Tools.
It may also help to trigger re-crawling within a day according to this Google Webmaster Central Blog:
Speeding up crawling may help to get Google Webmaster Tools to reflect changes quicker.