This evening we noticed the bees spilling out of the entrance as if there was not enough room in the hive. I know there are at least six empty bars of room at the back of the hive.
In an attempt to fix the problem, I slid all the bars back and inserted an empty bar in front, we call it bar #0. It didn't take long for the bees to move inside. I finally removed the old pollen patty substitute and the empty syrup jar that is over a month old with mildew.