API Error 100 Sharing Food Menu Links – Dynamic URL Fix?

Hi Facebook Dev Community,
Users get API Error 100 when sharing pages from my food menu site https://menupriceinuk.co.uk/.
Tried: ✅ Verified Open Graph tags. ✅ Encoded URL parameters. ✅ Tested Graph API + sharer.php.
Issue: Dynamic paths (e.g., /menu/burger-specials) trigger the error, but static pages work.
Ask:
Are special characters in menu URLs causing this?
Any fixes for React/Node.js sites with frequent price updates?
Thanks for any quick tips!