There are many online trees ON Ancestry that have similar situations. Point being it is not isolated to the OneWorldTree trees.
I have found many mistakes, and some just as gross as the example given.
Like the other poster I get frustrated when I offer the original documents to correct their error and I am ignored.
Then there is the other case where I have made several offers and no one has responded. Then within two days I get two responses. Not realizing they are two different people I respond to the emails as if I am responding to one. So if I have did that to any one please forgive me.