Hello Maruti,
Same problem (two dates on posts) as others have mentioned. I have Hiero v1.5 installed as well as a Hiero child theme.
Went to themes – searched for Hiero and said current version (1.5) already installed. If there is a v1.6 WP is not showing it.
If there isn’t a v1.6 the double date is still an issue.
Thanks for your time and efforts,
Tom