I have about 6 studs on the part file. When I use male/female standoff to finish the assembly all of these who up on the face of the part.  I can't show this on the drawing so I suppress all of them.   After I rebuilt, the circle show below disappear but all of my studs are no longer in the position where they should be.  They float in the air.  What happen?  I can't undo now.  Please help.  Thanks