Hey guys, I'm doing 6 racks of BBR on my WSM today. Had to use a rib rack on top. After one hour there is some funky looking stuff on the end tips? Thought it could be blood but I cleaned them well. It's real black & looks like gunk from the smoker dripping on it but the inside of the lid is also pretty clean? Any idea on what this could be? I have family coming soon & saint wanna make anyone sick?