Open Graph tags do not work as expected

I’ve installed this plugin and tried to set up Open Graph tags, but they don’t work as expected – or I just don’t understand how they should work.

Questions are:

1. I’ve set up the Open Graph section, which generates tags like these:

<meta name="og:type" content="webssite" />
<meta name="og:title" content="..." />
<meta name="og:image" content="https://... />
<meta name="og:locale" content="en_US" />
<meta name="og:site_name" content="..." />

According to the Open Graph protocol as specified at https://ogp.me/ the correct tags should be meta property="og:..." and not meta name. And in fact, when checking my pages with the LinkedIn Post Inspector, it does not recognize the tags.

When use custom tags to generate meta property="og:...", then the LinkedIn Post Inspector picks them up correctly.

Besides that, there is a typo in the website type (spelled with double s), which should be corrected.

2. So I’ve setup default Open Graph tags in the plugin settings as described above (using the custom method), but now when I want to overwrite them with specific settings on a some pages, the tags do not get replaced, but are inserted both. This causes the Linked Post Inspector to pick up the wrong tag.

Is there any way to make the plugin replace tags instead of just adding them to the default ones?

Thanks, and forgive me if these are dumb newbie questions. ??

The page I need help with: [log in to see the link]