I created 6 sprites with the same size in Illustrator, but they are given different sizes when sliced by the sprite editor

I have tried anything but nothing works, so I came here to seek help. I created an alien spaceship that has some lighting sources spread over it. I am just changing the lighting color between sprites, so it will create an animation. So I put all my sprites in the same document, aligned them with equal spacing and height (based on their centers) but when I slice them with the sprite editor, each one is given a different width, so the spaceship moves a little bit to the left and then to the right between frames. Is this a problem that related to the vector artwork of Illustrator? What can I do? The PNG version of the artwork

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