Try not to worry, it's probably more common than you think. I still fret about the fact that when my husband and I first got together, over 25 years ago, we were looking fir a place to live and it was quite stressful with lots going on. We sat down to talk through all the places we'd looked at and he started talking about one that I had absolutely no recollection of viewing. Never was able to remember it at all, still can't!
A while ago, my husband was tying down his loaded trailer with a rope and no matter what he did, he couldn't remember how to tie his 'lorry drivers knot'. He spent about half an hour trying and gave up, just tying it the best he could. He's been tying that kind of knot a few times a week since his dad taught him when he was 8. He drove home, unloaded and the tied it straight away.
Things like that happen to us all at times. I'm sure you're perfectly fine.