Your title and description are formed properly. The keyword tag is deprecated as far as the SEs are concerned (none of them use it any longer) so that can be deleted.
IMO the likely reason Google is using part of your footer ("...Rootbeet is not responsible for any misuse of the products purchased in this site.It's important to know that the FDA") is because you are searching for your site name "Rootbeet" and your footer is where that text is displayed.
SEs search primarily for text. Yes they now include images & video, but text content is still how their indexing is built.
If you searched for related topic terms (and not your exact site name) your site appears using your meta description as intended.
Also, and I feel this is very important, your code vrs. content is waaay out of proportion. You need more text... more article material, especially on your home page. This is what SEs will match to the search terms your potential visitors will use to find a site like yours.
Nice looking site BTW. Good luck.