The most common explanation for AC unit water “leakage” is simple condensation. The droplets you’re seeing around your unit actually come from the water removed from your indoor air during the process of cooling. The removal of heat results in water condensation.
A more serious issue that could also be the cause of your AC unit water build-up is ice melt. When your unit accumulates a lot of dirt in the filters or fans, the leakage becomes a much more serious problem.