Hello @erum-shaheen,
When we tested the theme locally, it is working absolutely fine i.e. the added info in the header from the customizer is displaying fine even in live preview.
– http://prntscr.com/l56pzg
– http://prntscr.com/l56qef
So in case if you have activated ant third party plugin then please deactivate them and verify the issue.
Further please see if there is any console error in the site by right-clicking anywhere in the page and select “Inspect“. This will open the developer mode for the browser where you’re able to view the site code and change over to the Console tab to view if the site has and javascript errors.
Hope this helps.
Regards!!