Hi ov_079,
Thanks for this update. I must say, this situation confused me as well. My sources are the Arriva NeTex data (from ndovloket.nl), ovinnederland.nl and the CHB (Centraal haltebestand) data (from ndovloket.nl).
The CHB data gives the locations of the bus stops and is the least reliable. I only use this location is I have no other information about the location of a bus stop, which was the case for Reddingsweg/Aisterburn.
Based on your information, I propose to move these bus stops next to the Knuppeldam bus stops. Because they have different names and bus_stop codes (ref:IFOPT), I'd rather not merge them.
Gertjan