Kitchen faucet (two separate handles, pull-out hose, Price-Pfister Catalina model) is dripping from the faucet itself. I shut the water from below the sink, determined it's a cold water, unscrewed the handle, removed and replaced the cartridge. However. As soon as I screw the cartridge in place, water starts dripping (both cold and hot water is shut off). If I unscrew the cartridge, water stops dripping (and nothing comes out of cartridge hole, so I suppose under-sink shut-off is ok). I tried unscrewing the hot water handle, same behavior exactly.
Question: Why the water is dripping and how do I troubleshoot/fix it?