SOLVED: Duplicated season with jumbled episode order

[Iskelderon]

In Jellyfin, on the series click on "..." and then Edit Metadata.  Change the Ordering to DVD order.



"Intended Order (DVD)" has the ordering you want.  The one you are currently getting is the original air date ordering.

Thanks, I've tried that now, but to no avail. 
Tried multiple sort entries, first without a complete metadata re-read and then with, all times without a change.

The section from the log was too long for the forum, so it's on https://pastebin.com/Z9CuNhLX