Kitchen Sink Plumbing Problem

When pushing down the handle of my faucet, the water does not turn off.
Full story:
Last week my faucet was leaking. The faucet has a valve on the side which sends water to the dishwasher, and it seemed that the valve was loose, so I tightened all the connections with groove pliers. That fixed the leak.
At first everything was fine, but now the faucet handle doesn't work. I can only shut off the water by flipping the valve to dishwasher mode.
Any suggestions?
q kitchen sink plumbing problem, kitchen design, plumbing
  4 answers
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