"move pivots" operator

[tyFlow]

The result you're seeing is because "on shape bounds (world)" considers the axis-aligned bounding box (not object-aligned bounding box) to do the position calculations. So it is indeed correct. Axis-aligned means each bounding box is aligned to the world (not the particle)....just imagine a non-rotated box created around each particle, encapsulating it. That's the bounding box used to calculate the new particle position.