I'm not clear on where you are going with this ...
Maybe I'm just tired, but I can't tell why you posted
Are you questioning the usage / setup of the Bean / Herbie, or are you just trying to understand how your own unit is working ?
There are Huge amounts of threads Online where you can discuss how the Bean and Herbie overflows work
So, are you looking for help, or are you posting 'cause you don't like it ?
Sorry if I don't catch the meaning of your original post, but I don't see what the problem is when you first posted that it works just fine .....