You can change a setting in the camera app so that your pictures always store on the external sdcard (sdcard1). In the camera app tap the main settings, looks like a gear, then storage location, then SD card.
I don't know why your camera would save them to both locations.
If you selected to store images on the external (removable) sd card, the camera will save pictures there, and also a thumbnail version on the internal sd card.
If you ever get your removable sd card corrupted, like it happened to me a few times, and you didn't have a chance to backup the last pictures you took, at least you get those low res pics. Better than nothing.
I use quickpic as well and love it too. I am glad I saw this thread and was able to move all of my images to my SD card. Anything that saves room on the phone is a plus.