I’m experiencing trouble with cleaning the beer lines. My cleaning bottle is all set up and connected to the gas supply. I turn the yellow switch on when I need to use the cleaning product and the pipe sucks it up into the beer lines. However recently when I turn my cleaning fluid on, instead of drawing it up, the pipe in the cleaning bottle is blowing gas out and bubbling the cleaning fluid. This is then not drawing the fluid into the beer lines. Any ideas? Thanks in advance.