weird shift of nodes?

Ok, I've seen some shifting of nodes needed when importing new masts or new objects of one type or another but this is totally weird!

right shifted, dropped and 90 degree twist?

The only mod was to stretch the rear gun deck and drop the rails some.
I can correct it but anyone know why it did this?
All the positions in hex remain as before the mod work
and models were not moved in 3DS Max.