Blocks appear strange upon exporting to pdf

See attached files.

When exporting from AutoCad to pdf, from paper space, my blocks come out looking strange.  I was having the same problem with text but fixed that by converting to Arial.  I am exporting to an Arch E size.  I have found that when I am zoomed out to show my entire campus, this is when I my problem occurs.  When I am zoomed in to show a specific area, export is fine.  

Anyone have ideas on what the problem could be? 

Using AutoCad 2014.  Files saved back to version 2010.

Let me know if I can provide more data, I am still learning my way around AutoCAD.

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