If you schedule a post to your Facebook pages, and they post two times, we suggest you take the following steps:
First, go to Facebook.
Go to the main mother page settings.
Click on "Settings".
Navigate to the "Local Content" section and pick a preference: "Always show, Never show, or Only show for locations that don't publish their own posts".
Go down to the next setting, the "Locations tab" section and select "Always". This allows you to publish directly on one of your daughter pages if still needed.