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If one thing was over another, it's just drippings. If all on one shelf, then some condensation might have built up against the top of your smoker, then dripped down onto the meats.
As Demosthenos stated, if drips were only on the lower rack of meat then they came from the upper rack. If they were on the upper rack, it was condensation from the roof of the smoker, especially if you were using the water pan.
I was using a water pan I have used the smoker about 10 times 2times I got black condensation and meat taste a littie funny 1 row or 2 why dos it happen is it the wood or water I have used Apple cider viniger
The black stuff is creosote. It is mostly caused by too much smoke. Are you producing a thick white smoke or thin blue smoke. Thin blue smoke or TBS is the goal.