Please tell me why this happens

That’s true. CAD drawings definitely don’t have vertical and horizontal consistency.
From now on, I’ll make sure to check before drawing.
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I’ll try creating it again. Thank you!

Thank you for all the information you gave me! I’ll try and recreate it.

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This problem can also arise if you inadvertently use the Move tool instead of the Push/Pull tool.

With nothing selected, the Move tool may grab an endpoint and change its location. This may result in the creation of diagonal edges that connect this endpoint with other endpoints that are not moved.