That is why I said that someone must have typed the wrong date numbers. It has happened to me but I catch it before I add it to my FTM. I take everything I find with a grain of salt until I can find real sources such as census data.
The sad part is if you are not familar with the family you can only go by what is written and also I have seen mistakes coming from the state clerk office.
So record keepping is a pain all around.