Jarno, I think you may have identified the problem!!!
I recall setting track mode to Lunar a little while ago and forgot about it. I checked the EQMod page of the indi control panel but it showed Sideral as being set. However, when I switch Tracking on (via Ekos Mount module), a quick message is displayed at the bottom of Kstars main window saying it is in Lunar tracking mode! I then re-selected Sideral in the control panel and now message shows it is in Sideral mode. So, hopefully that's it. Just got to wait for a clear night to test. Many thanks for your help, it is much appreciated.

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