CF6
Just goes to show one shouldn't jump to conclusions and happy to stand corrected. On reflection I wrote my penultimate post after a long night flight so maybe it wasn't as well phrased as it could have been.
Anyway, as you will know very well there are lots of things going behind the scenes with the AFDS that are not annunciated eg runway alignment. I can't offer an explanation for the discrepancies other than maybe they're are different modification states of the FMC perhaps. When you get into how waypoints are coded in the FMC and things like "on approach logic" 'tis a dark art indeed. Anyway, anything I can add I'm sure you would know as a fellow operator so I'll leave it at that.
BBK