One or more window bolts could be loose, causing the window frame to bind up and prevent window from closing snug. Check and tighten as needed. You might also use a special window track spray lubrication to help the window slide closed easier.
As far as the window screen popping off, a window screen in one of our trailer bunks keeps popping off and has nothing to do with the window frame being loose or misaligned. Just poor construction.
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2019 Jay Flight 264BHW, Rocky Mountain Ed.
2020 Ford F150 XLT SuperCrew, 3.5L EcoBoost w/Turbo
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