Hi, I’m having the same problem as you.
I’ve updated my title in the Yoast SEO metadata box and my page has been crawled by Google, so the changes have been taken into account. However, the sitename remains in my title.
Interestingly, the source code displays the correct title, but it doesn’t appear correctly in the search engine results page (SERP) for the desktop version.
On the other hand, the title does appear correctly for mobile devices. I don’t think this is a theme or plugins problem, as it works for mobile versions.
