Are you sure you didn't just drool on the plant while looking at it
Seriously though.... if there's water on the plant then it came from somewhere.... either you spilled some on it while watering or someone else did. Water shouldn't hurt the leaf unless it was loaded up with nutes or the light is really close to the leaves... in which case it could burn the leaf.
If this is a one time thing I wouldn't worry about it.... but if you are noticing it every day and you are positive you aren't splashing water on it while watering then I'd get to the bottom of where that water is coming from.
high humidity can cause them to sweat some. it may not be a problem right now but it is a potential threat to your girls. mold and bugs like higher humidity and still air.