Sharing here as well…
Seems that (at least in my case) there might be a bug on Chrono When-cards (tested only stopwatch and timer), when triggered by minutes… here the full “story”
Double triggering (to start) of flow - Questions & Help - Homey Community Forum
Changed now all in my flows to be triggered by seconds as minutes made double (even triple) triggering (and resulted high load / HomeyScript trips).