Camera workflow, driving me nuts

Hi, I am working with placing several cameras with different background images.
Camera 1 ----> 1.jpg
Camera 2 ----> 2.jpg
Etc…

Every camera is a duplicate from the first one so I am guessing here is where the problem starts.

I place the camera 1 according to its background image 1.jpg
When I place the camera 2 according to background image 2.jpg then camera 1 takes the background image of the 2. Somehow the background image seems to be linked when I duplicate the camera.
It is really frustrating.

Did you activate the selected camera, try crtl+0 or view->cameras->set active camera