Here's a story from my personal experience.
When I started researching my maternal grandfather's family, I came across some conflicting or confusing information.
My aunt had shared her research (all done before the internet) with me, including a date of birth for my great-great-grandfather (I think she had a copy of his birth record).
As I tried to track my family in the census records, I found a boy who matched my g-g-grandfather, but he was with a different set of parents. I had to follow this other guy forward in the census records to see where he was living and his marital status at the time that my g-g-grandfather married my g-g-grandmother, etc.
I had to do this because I couldn't find my own g-g-grandfather in most census years! It turned out that his family was poor and moved around a lot; plus, he and his siblings spent time in various workhouses. It also turned out that he and this other guy were born in the same town, in the same year, with the same name.
But I had to follow the other guy in the various records to make sure that 1) my aunt hadn't made a mistake and put him with the wrong parents, and 2) my g-g-grandmother hadn't mistakenly ordered the wrong birth record for her husband after his death (perhaps in order to qualify for a pension; I couldn't rule anything out, since I didn't know the circumstances under which the certificate had been acquired).
The important thing is to prove everything for yourself.
Regards,
Josephine