We have a single lever Moen faucet in the kitchen. We recently unclogged the warm water line, solving that issue only to have a new issue develop. Now when we turn the lever for cold water it slowly warms up. This is the only faucet where this happens. If we shut off the hot water line we get cold water again. However, if we open the hot water line up only enough to have the water come out at full strength we can't get any cold water, only slightly warm water. We're not sure why this started happening. Again, this is the only faucet we have this trouble. Any ideas?