Titles & Meta -> single post title | headline

I have a question regarding the single post title and headline in your plugin. So, for instance, I want to change the template of a Single post title and add my own unique word: %title% Top 20 %sep% %sitename%.

Below, there is a chance to choose a schema type, I chose article. And below that, there is Headline with template: %seo_title%. I updated it with %seo_title% Top 20, so the Single post title and Headline are the same.

But I have an error when I check this article in google’s schema markup testing tool, I get the following:
TITLE Top 20 | SiteName.com Top 20

As you can see, my added word Top 20 doubles in that markup after sitename. What can I do about it? If I delete Top 20 from %seo_title%, will my posts still be shown in SERP with that added Top 20?
Thanks!