OpenHab 3: rrd4j files despite using influxDB

I started out fresh with OpenHab 3.2 and this time using InfluxDB.
So I have added the InfluxDB plugin, configured it though UI and set the persistence service to InfluxDB (in UI)

When I check InfluxDB I see data there.

But I also see freshly created/modified *.rrd files in openhab_userdata\persistence\rrd4j

Is something wrong with my config?

No.

RRD4J is installed and storing data by default in OH3. To prevent that just remove the RRD4J binding.

ok, thank you