Last night I was awoken by alarm that there was a leak detected in basement. I raced downstairs to find a slug crawling across the top of one of these water sensors:
WTH?!?!??!!? I am not sure exactly how that happened but there was definitely no water on floor and the sensor probes are on the bottom of the unit. BIZARRE!!!
I guess slugs typically seek out damp environments.... So maybe it was nature providing you with a warning...
It's a sign, get ready for the big one.
Love it...now even the slugs are messing with us. Teach us a lesson for all the kids who went around pouring salt on snails and slugs...eww.
Give's me an idea on conductivity tests for insects with my sensors in the basement. 
I just had the same sensor set off by an earthworm this time. YOU HAVE GOT TO BE KIDDING ME!!!!!!!!!
One more time immediately go buy a lottery ticket!!
Is this on a concrete floor? If yes that is likely playing a factor given how much moisture is in concrete. I had similar issue with a leak sensor in my HVAC drip pan that all of a sudden started reporting wet. Solved it by putting a small piece of paper towel below the sensor. The paper town provides a barrier but will also absorb the water if there is a leak.
I can solve this. Stop putting leak sensors in your rose garden. 
It happened again! This time it was a slug like 1st time. I am thinking some salt on the floor might be an option. I have 2 moisture sensors at this location about 3 feet apart for redundancy and it was a different model of moisture sensor than the 1st. This is not good for WAF. It's like The Boy Who Cried Wolf.
With me it was flushing of the hot water heater and calcium build up from the last flush in the pan that I have the sensor. The calcium held enough moisture when the humidity was high to trigger the leak sensor.
Did you try putting a small piece of paper towel below the sensor? Something absorbent that will separate the contacts from the floor should solve it.
I have 11 leak sensors in my condo.
I am always putting a largest possible piece of paper towel under each sensor.
This actually significantly increases sensitivity area in addition for surface-sensor isolation.
I have also had a leak sensor near my basement back door triggered by a slug.
Maybe yall need to treat your leak sensors like a castle and have a moat of salt around them
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