My ghost version is 2.9.1 and everything is working fine on front-end but in admin panel it doesn’t show green ssl lock so i looked up into console and found that it is giving mixed content warning for images and when i open those images in new tab they all are served using https but they are served as http in admin panel. I checked my ghost blog URL and it is also HTTPS.
Edit: I have solved my issue. So this topic can be closed.