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There is one spot that the faucet (not plumbing to the faucet) could be leaking from due to change in back pressure, and that would be after the shutoff point in the faucet itself. When your faucet is off the pressure in the plumbing and all the way up to the faucet shut off would be 55psi for example. However, after the faucet shutoff there is no pressure at all, inside the actual plumbing of your faucet assembly. When you add the RO/DI unit there is now backpressure created between the faucet shutoff point (no water / no pressure when operating as normal faucet and nothing attached to the outlet) and the connection at the RO/DI unit, and is most likely where it's leaking from. It is then probably running down underneath the sink when you see the leak at.
Easy fix, go and purchase a new faucet from Lowe's or HD that's fairly inexpensive. They're easy to remove the old one and install the new one and you should be good to go then. Or if you have copper feed lines down below purchase a piercing saddle valve and install the unit this way and you by-pass the faucet altogether.
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