Two of your cameras have crossed Camera ID's this happens when you insert an SD card that was in one camera into another camera, without formatting the card. It will take on the identity of the other camera. Treat these cameras as you would any other digital camera. Especially since you have multiple systems. You need to designate 1 or 2 SD cards specifically for each camera. Do not insert them into any other camera. Formatting SD cards directly from the camera does not clear the settings file the camera has put onto the card. The settings file contains the camera ID. Therefore, you never want to cross SD cards.
To correct the crossed camera ID’s, you will need reset the camera ID's. The only way to reset the camera ID is to update the firmware on each camera. This will reset the camera and it will get a new camera ID when it dials into the server.
You will need 2 blank SD cards then format them to fat32 on your computer or buy new cards that have never been in any other device before. Download the camera firmware to each SD card. Do not change the file name.
Unplug the camera from the modem so it does not try to dial in while you are working. Insert the card into the camera and walk through the steps to upgrade the firmware. After doing the firmware upgrade format the SD card in the camera. Before plugging the camera back to the modem allow it to take a picture so it will go ahead and create the XML file it needs to transmit. After the picture is taken turn the camera off and plug the modem into the camera. Turn the camera on and press the test button on side of the modem. The camera will get a new camera ID when it dials into the server.
Follow the same steps with your other camera. When it dials in it will get a new ID and you will see both cameras again on the dashboard.