Molding Apple Sticks?

I got some apple sticks not too long ago from one of the sellers on here for the chins. I opened the package and gave one or two to the boys, and then I just put it back to where all my supplies were. I didn't touch them again for 2 weeks. Yesterday, I went to find them and they were all moldy with green stuff =( I ended up just tossing all of them. I also ordered mulberry twigs and they were fine. Has anyone else had this happen? Everything else in the container was fine and not moldy at all