Tuesday, June 24 at 9:50am: Why is CitiBike adding bikes to a station that's almost full?

The CitiBike stations at West 54th St. and 9th, West 52nd St. and 9th and West 52nd. St. and 8th are empty:

Now, I had always thought that the always-full station at Broadway and 52nd was full because morning commuters were docking their CitiBikes there.  But this morning I found a rebalancer ADDING more bikes to this station:

Why is CitiBike not using rebalancers to add bikes to stations that are empty?