We're sorry you're having trouble with the Zip widget.
If you're seeing two or more widgets on the checkout page, you may have copied and pasted the Zip Widget Lite script multiple times. Check your chosen theme to make sure it's only in your code one time.
You can also review the full installation documentation here. This link will take you to everything you need in order to integrate the Zip widget.
For any questions or assistance please contact Partner Support