Theme options are lost after the the child theme activation.
In case you activated the child theme after dummy data installation, some theme options will be lost (That was the requirement of the Themeforest team). In order to disable this behavior, please open wp-content / themes /your_theme_name /includes/theme.options.php file and look for the code like this:
// Clear all saved Theme Options on first theme run add_action('after_switch_theme', 'theme_options_reset');
where "theme" is your theme name.
You need to comment the function:
// Clear all saved Theme Options on first theme run //add_action('after_switch_theme', 'theme_options_reset');
Then save the file and upload it to the server.