That sounds kind of like dissociation to me. Mild version of it, but still dissociation. I lose things a lot and "forget" if I locked the door or turned off the light also. It's more that the memory was never planted in the first place. It's kind of hard to explain.

Here's a good explanation of what it is...

Dissociation FAQs - ISSTD

Hope this helps. As always, check with your pdoc or T, if it's really concerning you or bothering you.