SweepSingleByChannel get different result

I try to use SweepSingleByChannel with box trace to two block boxes which box position has same X and Z, and they are very close but have a small gap between them, no overlap. Then I call SweepSingleByChannel every frame, and make sure that it can trace two boxes vertically at same time. Strange thing happened. SweepSingleByChannel would get different results when I control player moving around the box, even if the input of the SweepSingleByChannel never change. And when player stand at a special position, the result Box_1 and Box_2 would alternation present, even if I don’t control the player.

Hello,

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Thanks