Thank you for your interest on the premium version of the theme.
If you are worried about data loss while moving on the pro version, we are happy to say all your your data will be migrated to the pro version of the theme so you do not have to worry about loosing anything if you are deciding to upgrade to premium version.
The posts in the section you are referring to comes from the latest posts when the option in Admin dashboard > Appearance > Customize > Static Front Page > Front Page Displays is set to “latest posts”. Please check ad verify the setting is implemented and saved correctly.
Also, please verify that in Admin Dashboard > Appearance > Customize > Theme Options > Home Page Options > Show Home Content checkbox is “Checked”.
If the steps above does not resolve your issues, please provide us your site URL so that we could inspect the issue further and provide a precise fix.
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