When I try to open up a step file containing multiple parts Solidworks is adding in three parts from my personal library which do not belong in the assembly.  I know that these parts were not inserted by whomever generated the step file and am curious as to why they are being added.  The C-frame case and plug floating above the assembly are the parts in question.  The files are saved to a company server along with thousands of other parts.  If I have someone else try to open the step file they do not encounter this issue.