Haha, I see the difference, but only by flicking between the two images in two separate browser windows with each one lined up to match their positions!!! It’s a spot the difference competition
The first thing to note is that quantize is non-destructive, i.e. it moves the note but it still remembers the original position. Then when you quantize again with a different setting the original position is used not the current position.
So, I’d say that you’d already applied a quantize to those notes that moved, but quantized say at the bar line, hence they’re on the barline in q1. But in applying the new quantize, q2, they move to the new quantize position which is nearest to their original position.
Could this be it?