Popolama,
Having spent (literally) thousands of hours at my PC building Company route data bases for transfer to the on-board FMC, I would have to agree with dusk2dawn that your selected WPT is probably not part of the Airway definition.
It is not at all uncommon for the NDB at a particular location to be the 'defined' waypoint for a particular location on an airway, in lieu of the 'expected' VOR nearby, and vice versa. This will not always be evident if cross checking against small scale en-route charts, it may only be visible on a larger scale chart, or, in some cases, the terminal area chart. This will be even more so when a particular terminal area has a multitude of VORs, NDBs etc.
Another valid reason may be that you've inserted an upper airway that is identical in routing to the lower airway, but does not include many of the the lower airway's 'non-compulsory' reporting points (the open triangles). If in doubt, use the lower airway, and discard the other extraneous waypoints.