Actually, a couple of weeks ago, I was adding some new info and records into my Ancestry private tree, and had similar problems. In one family line in particular, names had been changed around, and some records had been deleted!! I had only two people (close relatives of mine) that I have known personally for many years, and who have been excellent assisting me in my research over many years! Only those two had editing rights, but when they both passed away about a year ago, I closed off their Editor status, so I'm pretty sure I must have been hacked in some way! I've been working on it solidly for a couple of weeks trying to get it right again, and still working on it! Fortunately, I have paper copies of certificates, census entries etc, so that's helping a bit!