My only analog quartz watch at the moment (not a GS) lands closer to the markers, but it’s barely a hair off to one side in one corner of the dial, then goes to the other side in the opposite corner — and seems dead-on in other areas.
My guess is that there’s a bit of slack in the geartrain in my watch, and maybe gravity or momentum leaves the seconds hand to settle differently.
It “averages” spot-on, though. It’s like the joke: three statisticians go hunting ducks. One shoots high and misses, the second shoots low and misses, the third yells, “We got ‘im!”
I feel like it would bug me if that was my watch. I like GS for precise execution of details. But the earlier comment about being wary of sending it in just for them to say “it’s within spec” would make me hesitate.