I am currently working with some models and drawings I made in 2002 and having some issues with  mates. The parts in the assemblies are all swept circular (wire)to form a multilayer cooling rack.  I went through and added distance mates to several of the circular faces.  I then went to the drawing to add dimensions and the dimensions center to center of the wires were not the distance originally mated.  Any ideas what is going on?  This seems like it should be straightforward.  I am running SolidWorks 2009 SP 3.0

Thanks

John