HSM Issue with Water Leaks

I have the following rule in my HSM to alert if there is a water leak:

Does this not mean that the water leak sensor has to show "wet" and remain "wet" for at least 5 minutes?

The following is an excerpt from the events of a particular leak sensor:

This shows that the sensor was "wet" for a total of 1 second!
Why did the Alert of HSM turn on in this case?

What action do you have upon getting wet?

The usual:
notification, echo-speaks, pushover, email, etc.

What I have done is to change the amount of time required for the sensor to be "wet", and that seems to have alleviated the issue.
It appears that different sensors take different amounts of time to "dry". They don't all snap back at the same rate.