[RHW413]

It appears there may be something in the song title causing the problem since in imports correctly as 'Bob'.
What is the exact name being used of the 'ghost' song that does not import?

Agreed - the exact file name is 'A Mighty Fortress Is Our God-LBW229.pdf'.  
I copied the pdf file and renamed it on the PC to 'A Mighty Fortress-LBW229.pdf' and it still does not import.
I copied the pdf file and renamed it on the PC to 'A Mighty Fortress.pdf' and it still does not import.

I just noticed that these files do not show up in the Companion after importing, and the Companion number of files matches the Songs number of files.