Hijacked callsign?

Patrick Sullivan

Someone, a 40wpm cw op, is either intentionally or unintentionally using my call. Looks like in Europe and maybe QRP as they are not getting picked up by many RBN spotters. Had this happened to any of you? Maybe it's a similar call that is misheard by the RBN?

de AC3K (the real AC3K) 

John Rogers

Hasn't happened to me however 'back in the day (1960s)' when an AC call sign was very exotic DX, there was some playful bootlegging of those calls on 20 meter cw.

de John, K3JR