RectTransform's bottom border changes in one resolution but in other doesnt change

Unity Engine
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1

I made UI auto scale for different resolutions from Unity, and it works well for all of them, but on my phone i have resolution 1080x2400, i tryed it in Unity and borders of object dont strech right, so there appears a gap.

Canvas values

Video of problem:

2

Done by stretching mods rect between top and bottom anchored objects.