Ordered two. One for my kids and one for my nephew.

I haven’t used Difrac in a while but you bet I have a manual somewhere on an old computer.

I assume that it will find the higher symmetry. But the diffraction patterns symmetry is suggesting the smaller P cell. I see no evidence of correlated parameters that would indicate the lower symmetry cell is wrong.

Unit cell is the P cell of the F cell. So the metrics are different but that’s just because it’s a smaller unit cell when it becomes P. I am
Personally leaning to polymorphs but I feel like it needs a subclass (symmetry polymorphs?).

No packing difference. I overlayed the unit cells for the two forms (after figuring out how the orientations relate) and they are identical. It could be some pore solvent that is harder to see that’s causing the symmetry changes.