How do I fix my pixel art from scaling while I am moving?

For example, I have a character which has 2 vertical lines for his eyes. Both the lines are 1 pixel width, but when I start moving and stop at a possible point, one eye remains 1 pixel width and the other one is clearly larger, maybe 2 pixels. How do I fix them from scaling or interpolate between positions?

Hi, which scaling method do you use for the viewport, letterbox or letterbox integer?

I am using letterbox integer, pixel rounding is on, pretty much all recommended settings for pixel art

Try to disable pixel rounding if you didn't try yet and tell me the result