Hi DeeJay
If RadarBox sees that it already has data for a particular Mode S code, it leaves it alone, so old data stays put.
You have two choices, both involving Database Explorer (on the File menu):
1 - update the info yourself or
2 - delete the record entirely and wait for the aircraft to appear in RadarBox again, when RB, seeing a blank record, will update it autmatically.
At the moment, the automatic update feature seems to be having problems, so it may be best to use option 1 for now.
Hope that helps.
Rod