LRW

It does seem a little odd.  63 sounds like a lot but there are 6518 airports in the current cycle so that's less than 1%.  I did post it on Navigraph's forum.  I was looking at the Navigraph files for those airports in other products, like Aivlasoft's EFB and the AirbuX A320.  The airport files were either empty or missing.  
 
I went back to the PMDG set for EIWT and I copied the 3 approaches, VDMB, VDMC, and VDMD.  I replaced the DM in the first three with 07 and in the second three with 25.  Now the CDU shows 6 VOR approaches, 3 for each runway.  So that would be a work-around for any airports that you want to use with the NGX.