Google will not always pick the user-created titles and descriptions. Google generates titles in snippets based on page content and relevance to search queries.
Sometimes even pages with well-formulated, concise,descriptive titles will end up with different titles in our searchresults to better indicate their relevance to the query. There's asimple reason for this: the title tag as specified by a website owneris limited to being static, fixed regardless of the query.
The same logic holds good for descriptions as well.
Google may or may not pick meta descriptions. It can pick any text from the page that it thinks is relevant to the user's query. Here is a quote from the same official page:
Google sometimes uses
<meta>tag content to generate snippets, if wethink they give users a more accurate description than can be takendirectly from the page content.