You must not question your memories – they are quite accurate, only they are from a different timeline, before the forking (split) happened that generated this timeline.
Correct me if I’m wrong, but you are probably new to this. If so, here are some interesting clips you can watch, people who at some point were also new to this. The most interesting aspect you can see in the last clip – it will freak you out (it did it for me).
mind blowing:
… now we know some of the dates when time travelers disobeyed some of the primary rules and regulations of time travel …