Component Quantities Reports

Hi all, 
I'm trying to get component reports for a road design.
Below is a screenshot of the component Quantities generated from the corridor reports tool.

This looks like it has captured all the different types of material I was expecting to see for this road design.  However, when I click on the 'report' button and choose the 'corridor Model ComponentQuantities Summary.xsl' some of the materials are missing.  Namely:-


Type F Barrier
Type F Barrier
Surfacing 1
Surfacing 2



The Total Estimate Cost is identical in both.

Any ideas???

Thanks in advance.