This has been bugging me for quite some time, since some of my address book contacts are affected. NSDataDetector does not properly handle addresses which have more than 2 numbers with one slash.
Previously, this issue was compounded by another issue in the geocoder which would take the apartment number (instead of the street number) for determining the geographic position. To workaround this I had to add another address to some of my contacts that didn’t have the apartment number. This seems to have been fixed in iOS 8.3, but NSDataDetector is still broken.