Water present while the sink is unused suggests a supply, valve, or appliance-feed path worth checking.
A careful observation separates leaks that occur continuously from leaks that appear only when the sink drains, the disposal runs, or the dishwasher pumps out. Keep the cabinet dry and accessible, but avoid disassembling wet connections before the source is documented.
Keep this boundary: Do not add sealant over a wet joint as a substitute for finding the failed connection. It can hide the path and complicate repair.