Happens so often.
Have something similar myself. Loads of trees with incorrect info, claiming that their ancestor Charlottes father was a Robert and giving a huge tree going back from that Robert. All very good - my tree back from Robert agrees with what they have found. Just one problem - I also have a copy of the Roberts Will, which clearly gives info about HIS daughter Charlotte, her married name, her husbands name etc. And that is very clearly not the Charlotte that the many many trees are descended from! Apart from the married name difference, "their" Charlotte died in childbirth, and this Will for the person they are claiming to be her father was written well after that date, mentioning his daughter Charlotte with a lot of detail as she was very much alive! And she is on my tree, and I know that all the stuff from Robert backwards therefore are her ancestors, and not those of the other Charlotte who had died pre Roberts Will.
So their trees may be correct back to Charlotte, but everything they have beyond that may be correct in itself, is not their ancestors!
And of course, everyone has copied it.
I can see what they have done. They have an approx. year of birth for their Charlotte, and the only one matching that on familysearch is the one who is the dtr of the Robert - so they have claimed it without any further evidence to back it up. See it so often! But sorry, the familysearch one is NOT theirs, their ones christening must not be on that site. So important to collect all the evidence you can, to confirm findings from as many angles as possible, especially when you get back to pre 1837 and pre census era.