Events fire multiple times in homematic

I’m running openHAB 3.4.0 on a Raspberry 4 (Openhabian).
In my CCU3 is a HMIP-WRC2 and in tail -f /var/log/openhab/openhab.log /var/log/openhab/events.log I can see LONG_PRESS and SHORT_PRESS events being fired. So far so good - but why are those events being fired multiple times within millisecounds?

If I press a button at least 4 events are being fired - very quickly. I trying to use a rule to map the SHORT_PRESS (event) to an item.

Please don’t tell me that this is normal behaviour.