I have never seen such a thing. Yikes - that's some bad smudging. Are you sure your cookies are really dry before you package them and that you haven't over-applied the airbrush coloring? Typically, the coloring dries VERY fast if not over-applied, but you might want to try waiting longer before bagging them. If you've over-applied, you can also accelerate the drying by placing them in a dehydrator on low heat or in front of a fan. Or box them instead, and then bag the box if you're worried about the box not being airtight.