Model appears rotated

I placed a square model, but the model is rotating.
I created a square model so that the square corners would be in the positions of the red circles, but that didn’t work.
Changing the position of the model changes the size of the rotation angle.
Center point exactly fits.
The length of one side of the rectangle is 1000m.

Why does the model rotate? Please give us somebody feedback.

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https://sandcastle.cesium.com/#c=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