Telldus Z-Wave Wall Contact strange behaviour

Hi,
Something really strange happend today, one of my Telldus Z-Wave Wall Contact got Activated, Desactivated and Activated again from Telldus Z-Wave, not from Web, not from Mobile, not from Flow.
Does anyone knows what “Telldus Z-Wave” is and how it can send a signal to a wall contact without my knowledge?
Thanks.
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