Hi @PCHamp,
This is potentially just a caching delay. If you’ve already cleared the cache on your browser and it’s still happening, it could be a server-side cache which would fix itself (but should have by now).
If that still doesn’t do the trick, just double-check that you’ve uploaded the correct robots.txt file. When file names are the same, it’s easy to grab the wrong version of the file.
For reference, just in case: Configure your website's robots.txt and image meta tags for social post link previews
Josh