In this case it is not merely a single cell that contains an unchecked symbol. It’s a large number of consecutive unches!
In reply to Foinaven, I find it very helpful to have the most recent messages at the top of the list, as I am often replying to them. We don’t have to click on the last message to reply to, but if we are replying to one particular message it is helpful to have that message in front of us as we type our reply.