Yeah, right you are, I checked the moderation log to see what happened, and it says I did it, heh. It must've been just now when I posted or something. Using my little Android phone, I evidently clicked lock somehow - it happened between 9:15 to 9:30, so yeah, as I was posting, my bad. Anyway, unlocking now.
EDIT: I remember, it was the zoom feature where you place your thumb and index finger and move them outwards to zoom in as I wanted to zoom into the Post Reply button. My thumb landed over Lock first, so that counted as a click first, not an attempt to initiate a zoom with my other finger... I thought there was something weird going on because then the page refreshed, so I wondered why it did that, but since I'm an admin, the Reply button was still perfectly available when the page reloaded, and I was able to post my new reply just fine unaware of what happened, etc.