Can you please provide us with an example URL of where you are experiencing the issue so we can check whether the plugin is outputting the title and meta description as expected?
Also, whereas Google typically uses the title from the metadata for indexing, this is not always the case. Google will sometimes modify the title of the URL as it sees fit, as well as sometimes adding the brand or sitename to the end of your title. This is not due to the plugin not functioning as expected, but rather is due to Google modifying the Title it indexes as it’s algorithm has concluded that there is a better version to index.
We also have additional information on this topic available at the following links: https://yoast.com/google-page-title/ and https://kb.yoast.com/kb/google-shows-different-titles-for-my-site/. Please refer to these articles as the include recommendations for crafting a page title which will help increase the likelihood that Google will use the title you specified instead of modifying your page’s title as it sees fit.
