Maybe I didn't have enough water in my brush when I charge.
I expect it is not too much water -- generally less is needed than at first expected.
Most likely you do not have enough soap on the brush.
I typically get 4 passes. Don't skimp when loading the brush with soap.
There is no shame in going back to the puck. Often it only takes a few seconds to reload the brush. Better to reload the puck than to worry about it.