Hello, @Harshal,
Simply go to the Dashboard >> XStore >> Theme Options >> Speed Optimization >> then disable the “remove Query string From Theme Static Resources” option see image: https://postimg.cc/QHqTVb4w and save settings after that check back to your issue by clearing the browser cache your issue will be resolved.
If still the issue will persist then please share your site WP Admin URL and Credentials with me in a private content area of this topic so that I’ll check and help you out further.
Regards 8Themes Team.