I'm experiencing an issue whereby, in my SolidWorks file, items copied over from .DWG files show up in the SolidWorks file when I am manipulating the file, but disappear when I try to print my .SLDDRW file to PDF.

For example, for this is what the .SLDDRW file shows in SolidWorks on one Sheet of my .SLDDRW file:
 

After I "Save As" PDF, much of this block doesn't copy over:
 

How can I tell Solidworks to