Error: particles do not fill all verts with the selected object

I try to create a roof with particles and one object.
I don’t use random parameters but the particles are not lineup with the vertices.
Emit from Verts.
I think is an error here.
I tested with emission number and need a large number to overlap the cone.
Use the blend file I share for all info.
Any idea? Thank’s!
house.blend (1.3 MB)

Does the number of particles match the number of verts?
In edit mode you can see the number of verts… not sure where it is on 2.8 actually.

Also - have you looked into dupliverts and duplifaces? Could be useful for you.

see the blend file I share for all info.