Happens to all of us. The amount of times you question yourself did I do something and double check to realise you did but can’t remember doing it.
I often get up to go and make a brew or go to do something and no sooner I’ve stood up than I have no idea what I got up for to sit back down and the 2 mins later remember what what I got up for.
I think I have awful short term memory. Yet I can list every car reg I’ve owned and several my parents owned when I was a child. I remember trailer numbers in the yard partly because of shunting but they stick in my head, also the reg of the trucks at work. Pointless stuff from years ago no problem, ask me where I went when I’ve juts got back from a run and most the time I have no idea where I’ve just been.
Maybe I’m just going senile nice and early but I forget such a lot in the very short term memory.