I have a website that triggers a warning when clicked through a link shared on facebook. The warning says: \"Possible problem with this link We have detected that this link
In short, you should re-fetch your website information using this tool: https://developers.facebook.com/tools/debug/
Paste your URL and press Debug. Then either do Fetch, or press Scrape Again. This will refresh Facebook cache, and your html-page will be reloaded.
Some additional info: https://stackoverflow.com/a/44453472/4899346