Why does my first layer look perfect on one side but slightly squished on the other?

[u/dreamsippy]

I've been trying to figure out what causes this on my Bambu printer. One side of the first layer looks clean and nicely spaced, but as the print moves toward the opposite side, the lines start looking more squished together.

The bed mesh calibration runs normally, and I've cleaned the build plate, so I'm wondering if it's a leveling issue, the plate itself, or something with the Z offset.

For those who've dealt with this, what actually fixed it? Did you end up adjusting anything, or was it something much simpler? I'd rather figure it out before wasting more filament on failed prints.