Has anyone encountered the following bug in subweldment cutlists?  I've not created complex weldments before so this is a learning exercise as well.

I have a primary weldment for which I have created a subweldment to simplify the part.  When updating the primary weldment with subweldment models open, the subweldment cutlist properties are modified with data from an unrelated cutlist component (angle iron) from the primary weldment.  The revised properties also seem to be permanent, as I cannot delete them afterwards.

Running SP5.0 so is there a fix for this?  Pics attached.