My kitchen slide does the same as you describe, and my DR slide is similar but not as drastic. I have examined both slides while someone else is operating them and I see no issues of concern. When they're in or out all the way they are plumb, and neither drag on the vinyl floor, so I conclude no problem.
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2016 Montana 3711FL
2005 Ford F350, 6.0 diesel, short bed
Demco Hitchiker Auto Slide hitch
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