I had a new tap put on my bath tub. The problem I have with it is when I pull the kbob on the tap to have a shower the water comes out the bath tap and very little comes thru the shower head. I do not under stand why the water is coming out the bath tap when the knob is pulled up for the water to come thru the shower, I have tried to adjust the knob. I have pulled it up and I have turn the knob screw down it still does not work. This is a new tap so why does the water barely come out the shower head when I pull it up? most of the water is in the bath

Thank you,

Lisa Stewart, Ct