OK - I sent the question up through our in-house TERPS/Procedures folks and also sent it to my contact at the Charting office and this is the answer I got back:
I just checked our publication and it looks good on our side. I would guess more than anything it’s how the pdf is reading the weight of the line and the type of line in the PDF and is changing it. I can see no reason other than a print error for this happening.
I sent some portions of the posts too where FB details where it has been seen before and the differences with the DoD -vs- FAA charts, so realize that his answers addresses what they can check in their pubs (which we already knew), but it does give some insight to a reason behind it from someone who works with it.