Aeotec MultiSensor 6 "On Time" state doubled?

Hello, when i change the value of the motion sensor “On Time” to 15 sec, the state doesn’t return from “8” to “0” after 15 sec but after 30 seconds. I don’t understand because it should return to “0” after 15 sec like i input in the zwave node config options.
When i input 10 sec, it needs 20 sec to return to state “0”.

I assume the value are doubled, but why? Is it normal?
Does someone have the same problem?

Thanks.