JourneyPatternPointOnLine JourneyPatternPointNumber not mapped to StopPoint

Some JourneyPatternPointNumber don't seem to map to StopPoints. Am I missing something?

Data retrieved using http://api.sl.se/api2/LineData.json?model=[model] endpoint.

Example:
// StopPoint not found
JourneyPatternPointOnLine(LineNumber=14, DirectionCode=1, JourneyPatternPointNumber=403) -> No StopPoint

JourneyPatternPointOnLine(LineNumber=14, DirectionCode=1, JourneyPatternPointNumber=407) -> No StopPoint

JourneyPatternPointOnLine(LineNumber=14, DirectionCode=1, JourneyPatternPointNumber=408) -> No StopPoint

JourneyPatternPointOnLine(LineNumber=14, DirectionCode=1, JourneyPatternPointNumber=409) -> No StopPoint

JourneyPatternPointOnLine(LineNumber=14, DirectionCode=1, JourneyPatternPointNumber=411) -> No StopPoint

// StopPoint found
JourneyPatternPointOnLine(LineNumber=14, DirectionCode=1, JourneyPatternPointNumber=903) -> StopPoint(StopPointNumber=903, StopPointName=Hasseludden, StopAreaNumber=903, LocationNorthingCoordinate=59.3487209527896, LocationEastingCoordinate=18.2442265231817, StopAreaTypeCode=FERRYBER)

JourneyPatternPointOnLine(LineNumber=14, DirectionCode=1, JourneyPatternPointNumber=952) -> StopPoint(StopPointNumber=952, StopPointName=Fjäderholmarna, StopAreaNumber=952, LocationNorthingCoordinate=59.3275350083536, LocationEastingCoordinate=18.1796027942421, StopAreaTypeCode=FERRYBER)

JourneyPatternPointOnLine(LineNumber=14, DirectionCode=1, JourneyPatternPointNumber=955) -> StopPoint(StopPointNumber=955, StopPointName=Gåshaga, StopAreaNumber=955, LocationNorthingCoordinate=59.3571426094096, LocationEastingCoordinate=18.2351920833212, StopAreaTypeCode=FERRYBER)

JourneyPatternPointOnLine(LineNumber=14, DirectionCode=1, JourneyPatternPointNumber=1051) -> StopPoint(StopPointNumber=1051, StopPointName=T-Centralen, StopAreaNumber=1051, LocationNorthingCoordinate=59.3313544053671, LocationEastingCoordinate=18.0614891478905, StopAreaTypeCode=METROSTN)