@anita6LE92 Thanks or the new PDF: someone set BASE command in the XREF file to something other than whatever it used to be (the default 0,0,0 is not quite it, but it gets close).
Then someone in the top file then decided not to drop the XREF at 0,0,0, but did a manual move somewhere far away (see below, Top file then the XREF)


Since AutoCAD does not keep a historical list of what got moved/changed where by default, it's hard to tell what needs to go back where from what I can tell. Maybe someone else can figure it out for you around here.
It may just be easier to fix it now, once, and examine why BASE command needed to change.
Summary: someone deliberately edited the default insertion point of your XREF. perhaps to fix the topfile's problem.