In reply to DL1DVE:
It’s well known problem Tom. I have been terribly confused myself when suddenly I find I am working 2 stations on CW. Despite clearly giving one callsign and asking only that station to reply (DL1DVE KN) I’ve still had two stations reply. On a few occasions the other station must be hearing me but is ignoring the fact I’m trying to work the other station, often sending their own call several times. I could understand this if the calls were similar but they have wildly differing prefixes you have to question what is happening. The better chaser will normally abandon the QSO until a few minutes later when the ghost chaser has gone and call again to ensure they get a vald QSO.
SOTA is based on trust and the level of questionable activations or chases is very low. That doesn’t mean the database isn’t queried to see if patterns of questionable operation can be seen. (The answer is yes, they can!)