Series is not a standard Dublin Core field. So while Calibre will embed the metadata with Polish, you must have done something else (a save template?) on your old machine to make your i-device happier.
You could have copied (exported) you preferences folder and used that (with minor path adjustments).
If you still have that old machine, copy the Calibre settings files that begin with "device_drivers....". Those are the settings saved for each type of your connected devices
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