I can relate to this with childhood memories. I can be adamant that something happened and ask my dad about it and he tells me an entirely different version that seems way more plausible.
I think our brain fills in the blanks when we don't have the full picture to allow us to feel like we fully understand something. I also remember watching a documentary about how the brain functions with memories and every time you recall a memory it changes a little bit. We experience so many things in our lives, big and small, that its practically impossible to recall so many details.