I have had a similar experience, bridgy, except that mine was a public tree, so fair game. However, I was shaken to see my family photos and loads of information on someone else's tree. I e-mailed the person asking about the connection, no reply, and got so cross because he/she would not respond to further e-mails. Eventually, I asked him/her to remove the information/photos, which has not been done. Looking at his/her tree, I think that it is just name grabbing.....and, like you, I see that there is now wrong information....ha!