Hello Praneeth Vinjam,
I can't format it better than Tom W
Here is the solution: Re: In 8.2 - how do I stop Tableau from renaming all my fields?
Lénaïc RIÉDINGER, Global Community Engineer Tableau
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Different problem Lénaïc, but I appreciate the tag as I can answer this anyway.
Your dashboard name contains a file extension in it i.e. .csv but that's being renamed to __csv so the browser doesn't think it's trying to render a file. I don't know if there's a way to override this automatic renaming but I really doubt there is as browsers could misinterpret the .csv extension of your dashboard URL and expect a CSV file to be rendered, not a tableau dashboard.
I'd stick with the automatic rename or stop using the period in your dashboard titles.