Wave breaking in the wrong direction at Cummersdale

I spotted a wave breaking in the wrong direction at Cummersdale on the River Caldew. The water was flowing away from me but the wave was breaking back in my direction. We think it was going over an old weir. It might have been reflecting off something and thus coming backwards. That is the condition needed to form a stationary wave and the formation was long-lasting although the water was flowing away down the river.