Your fridge also makes water from its auto-defrost cycle (often 15 minutes every 12 or 24 hours). This will typically defrost behind the freezer compartment, drain down to a catch tray that drains to a tray underneath the fridge [where it will then evaporate back into the kitchen]. If that drain line is plugged or frozen, it could leak somewhere else. If the defrost has failed, you can get uneven (and eventually little/no) cooling.