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