Example:
Each line of output the line numbers fall a tiny bit behind vertically, until by the end of a long job the line numbers may be completely off screen, hundreds of visual lines away from the lines they are annotating.
In the example here, the 362 line number actually goes with the last line in the screenshot.
By later in this job, line numbers in the 13000 range were multiple screen-fulls above the output they annotated.