NextGen Plus Gallery Short Code Showing Up on Two Pages

I am redesigning a website which requires multiple gallery pages:

My issue is that two of the pages – “Vertical Daylighting Systems” and “Bike Shelters” – will display the same gallery as the other if I set it up on one. For example, if I assign ‘bike-shelters’ to the Bike Shelters page through the NextGen WYSIWYG in the Visual Editor, Vertical Daylighting Systems will display the Bike Shelters gallery, and vice-versa.

http://www.duo-gard.com/new/showcase/vertical-glazing/

http://www.duo-gard.com/new/showcase/bike-shelter-project-gallery/

Any help with this would be greatly appreciated.

Thank you.

https://wordpress.org/plugins/nextgen-gallery/