About a year and a half ago, a similar situation occurred on GenForum. I posted a couple of messages and then noticed that the user name and ID number was not mine. I clicked on the user history for that name and found that quite a few people had messages that wound up under this mystery user's name. Some of them had noticed, most had not. It took me quite some time before I was able to rouse anyone in support about the problem. Eventually, they just shut down that user name and ID. I imagine that, to this day, some people have no idea this occurred. I contacted as many as I could by looking up their previous posts under their correct IDs. The bad thing is that, if some of them get a response, they will never know it. I was never able to figure out how this happened, or if that user even existed.