No idea how old your trailer is. If it's still in warranty, let the dealership take a look at it. The way Keystone "says they build slide frames" should preclude any "off square construction" but that doesn't mean it can't happen.
If you're no longer in warranty, remove the slide facia, measure diagonally, top left/bottom right and top right/bottom left. They should be the same, then do the same on the inside outer wall of the slide. Those two should also be the same. If so, the slide is "essentially square. Do the same for the slide opening.
If the slide or the opening are not square, and you're no longer in warranty, it may be cheaper to live with replacing the eterna-bond tape every couple of years than in fixing the cause.... If it's in warranty, the dealership and Keystone ought to do the right thing and fix it for you.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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