On the computer—
1. Open one of the duplicate projects, click the 'Manage & Share' button & then choose 'Merge Project'.
2. In the Search Field, start typing the name or address for the duplicate project. A drop-down menu will show all possible projects in your account, click on the correct project.
3. Next, select which project to keep and the other project will be deleted. (Note: All photos from both projects will now be saved in the project you've selected to keep.)
4. Click the green 'Merge Projects' button and that's it! You're done!