Title Character Count is incorrect – or is it?

In any page or post, the plugin will automatically draw the “title” from the post/page title. When we don’t add any text into the SEO title field box, it shows the page/post title in grey color along with the character count in grey color.

When we add any text into this SEO title field box, it counts it as an addition to the title.

For example, if the original post title was 30 characters, that is the count shown in grey color. If I add any text character into the SEO title field box provided by the SEO plugin, that character is added to the count, making it more than 30 characters.

Checking the documentation per the “?”, it does not explain about this count method. I would think that if we insert any text into the SEO title box, it replaces the title for the page, not adds to it.

So please explain how this works for the title. Does it add to the page/post title, which explains adding to the character count, or does it replace it, which then the count in the SEO title box should be corrected to match.

Please explain it.

Thanks