I have gotten 7 confirmed matches. Ancestry.con advises you to examine the details of the match before YOU confirm it. In all 7 matches , the generations concurred.Even though, you and the match share a common ancestor(s) there is the possibility that you errored in the sequence of descent from the ancestor. However that would have no bearing on the DNA you have from the ancestor. A seemly accurate and well documented paper trail could be wrong. Because the people writing the documents could have made mistakes or lied.