I think the problem is that radarbox has a problem with the + sign
It's more fundamental than that, it potentially affects any aircraft that has a non-ICAO or non-unique registration.
RadarBox, even though it knows the actual type from having looked up the Mode S code in the AirNav database, doesn't check the details that are returned from airliners.net to make sure that they apply to the same aircraft.
The good news is that there's a fix in the offing, shouldn't be long now.