I think that the series name should be unique, in order to eliminate confusion with another series that could contain the same name. And adding the mint name was the only way I could think of to distinguish it from the other series.
Series in denomination field I think were recently removed as series should be added in the series field.
Not sure if this was the case for the Franklin Mint Series set here?
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I’ve also noticed some issues with the Swiss banknotes. Certain series have simply disappeared from the main page (but are still visible when opening the translation tab), such as this one or this one.
In some cases, series with generic names like “2nd series” are mixed up with other items, as seen here: link.
Other series work correctly and should look more like this: link.