My 2006 will do the same thing. PopUp Gizmos will help but not eliminate the problem. I gave up and just fold up a small towel in the corner and change it out frequently.
On mine it seems to follow the channel where the canvas attaches and then exits the bottom.
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2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.
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