Rest assured that this is a normal physical phenomenon.
Once the feeder opens its lid to dispense food, the ambient room air comes into contact with the cooler interior environment of the feeder. Consequently, due to the temperature differential, condensation may occur and result in the appearance of water.
You can directly use a dry towel or paper towel to clean the affected area. Please rest assured that this occurrence does not impact the functionality of the product or compromise food preservation.