Sounds like you have a roof leak and are lucky enough that leak is draining on the outside of the tent instead of inside.
When my earlier pop up had a leak in the roof and leaked inside, it left dark brown streaks where it was running down the canvas.
So your black stripes, as my brown stripes, must be something from the material in the roof.
Good luck in getting that leak stopped.
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2024 Black Jeep Grand Cherokee L Altitude 4WD, 121" WB, 3.6L, 8 speed, Blacked Out Package, 265/50R20 wheels, 6,200# Tow Rating, pulling a 2020 Rockwood Premier 2716G Pop Up, with a 14' box. Go through Indiana Dunes NP 5X/week! Previously had 2012 Jayco Jay Flight 26BH and 2008 Jayco Jay Flight 19BH Travel Trailers. Also previously had 2007 Starcraft 2406 Pop Up with 12' box and bathroom, Previously had 2005 Rockwood 2290 Pop Up with 12' box and porta potty cabinet.
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