A model transforms from the world to the screen, and then from the screen to the world, getting the result of an xy exchange on the vulkan platform?

What makes it possible for a model to transform from the world to the screen, and then from the screen to the world, to get a result of xy swapping with each other (x becomes y, y becomes x, the image is completely horizontal) on the vulkan platform?

I just simulate the result of mobile phone in editor like this: