We just put our 5 week old chicks in their newly constructed coop. I bought one of the 3 gallon waterer that uses the vaccuum to self water. It does not appear to be working and continues to run over. I tightened the lid and it appeared to stop flowing, but within a minutes it slowly began to overflow again. There is a rubber ring on the threads...could be this be in the wrong place? Should it be at the bottom the treads? I am trying to figure out if this is operator error or problem with the waterer. thanks!