Additional info:
In 2017, the user timsdeepsky fixed (i think) the same problem. This was his answer:

This I resolved by purging Kstars bleeding, and then reinstalling Kstars bleeding....It just started working perfectly after that....

He didn't use a windows computer, I do, and frankly, I don't know what this solution means. Can someone help me with this answer?

Thanks Sebastiaan

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