My camp was spawning rampant items. I had taken some things out of my tent to move it, and i placed them next to this river. Over the course of the next day, i witnessed tons of duped magazines and such. I tried to put them all in backpacks and hide the backpacks in order to get rid of the issue, but it didn't stop.

Album, showing the piles of magazines that have duped: http://imgur.com/a/gR91Q