Content shakes when animating size for canvas group

When I update the size (per frame) with animation, the content inside shakes along the y-axis like so:

Is it possible, or how can I fix this issue?
(Pink objects are size animation, from 31px to 0px)

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Could you send a screenshot of the hierarchy of this UI? My guess is that the grey upper frame that you click on is within the pink frame, otherwise I don’t see how its size changing can influence the grey one.

whenever I parent the object outside canvasgroup it works completely fine (but I can’t do corner clipping properly)

image
this behavior doesn’t replicate when using global zindex, but cannot do UICorner clipping
(with higher graphics quality, the object looks like its duped)