Hi Craig,
Thanks again for looking into this. We are also using Totara 12 and the settings you mention were selected. I have no explanation as to why our outcomes differ. We also reached out to our local Totara-implementation partner by now, and they confirmed that we used the right settings. They did provide us with an alternative solution that will save us some time so we have gone with that.
Thanks again for your help and insights. Cheers!