"Left lane closed" sign in the right lane. Why?

Here’s your sign. This is the third time I’ve seen them do this in a year, in the same spot and I can’t, for the life of me, figure out why.
I know it’s a bit hard to tell from the angle, but that sign is smack in the middle of the right lane which means everyone has to move over to the left lane to get get around the sign. If it happened once I wouldn’t think much of it, but it’s happened a handful of times now and I’m failing to see the logic behind it.

Also, in case it makes any kind of difference in anyone’s answer, the street I’m on and the cross street are both two way streets (until you get under that bridge several blocks down) and that intersection has no turning restrictions that I’m aware of.
It just seems to me that if there was a good reason for it, it would be done more often.

The only thing I can think of is that every time that lane has been closed it’s been the same crew and either someone has been too lazy to drag the sign all the way out (or all the way back to the curb at night, in the dark, during rush hour downtown across a lane of traffic) or someone thinks they know better then the DOT on how to block traffic and close a lane. Maybe he has some reason in his head for doing it that just I’m just not seeing.