Spatial order parameter

Hi

I am analysing a structure of a molecule and I have a problem with order parameter. What could be the reason for order parameter analysis calculating intermolecular components for one molecule?

The molecule has a propeller type structure: connected three graphene-like arms. For each of these arms I created distance monitors. When I run spatial order parameter analysis just for one molecule I expect to have only intra component, but I get inter as well. Material Studio recognises that this is a molecule and I am sure that three selected distance monitors belong to that molecule. In the box I have more of the same molecules. When I analyse them separately, order parameter correctly includes only intra component for them. So I get inter component just for that one molecule. What could be wrong with it?

Thank you for any suggestion