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Sounds like diverter valve which is your shower handle valve is bad take it apart and check out and replace it if possible because that transfer water to shower head.
check the tub faucet the pull lever maybe slightly faulty causing back pressure in line and pushing water up to shower head --u may have debris in tub line causing partial blockage -or u have alot of water pressure coming in and it is to much for the lines to handle and it is pushing up to shower head
The only possible explaination is that the water is finding it easier to go up than down. Water is lazy, just like me. ;)
Use an allen key to remove the tub spout. It's underneath and awkward. Once the allen key is loose, the spout just slides off. Try running the water. This may solve your problem and all you'll need is a new tub spout. If not.....
Turn the water off to the house.
Use an allen key to remove the handle.
Use a phillips to remove the trim plate (2 screws). Cut the silicone around the trim if it's there (which, in a proper installation it shouldn't be, but...)
Unscrew the nut (usually chrome) holding the cartridge into the brass body of the valve. The cartridge pulls straight out. Check for restriction in the ports of the cartridge itself. Check for restriction in the line going down to the tub spout. If you can't find anything, replace the cartridge.
Verify the height from the shower valve to the Shower head, the instructions specify the correct distance if it is too short the pressure could be getting up to the shower head.
Perhaps the water pressure it too high at the valve not allowing all the water down the faucet outlet, there are set screws on the sides of the shower valve to adjust the water allowed in the mixing chamber.
Something is restricting the water flow to the faucet, creating enough pressure to send some of the ater supply up to the shower.
Replacing the cartridge should solve the problem, the balancing spool is stuck, replacing it will solve the problem. The valve should look like this http://www.moen.ca/shared/pdf/3170pt.pdf . I have unstuck the spools in the past, soaking it in white vinegar will help to remove build up.
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