There’s two different issues here. Originally we used the default of 20 search results for genres and moods. We fixed that a few months ago and upped the max limit to 50.
Second, the genres and moods are country-specific. Right now we are not passing in a country code, hence people will see different results in Volumio’s Spotify plugin and their Spotify app or Web player. As we migrate fully to the new API and support Spotify OAuth authentication we will support API calls passing in the user’s country code.
It was fixed on Github but the released plugin is still dated 13/10/2016, or is that date incorrect?
Edit: I have 32 entries in ‘genres & moods’ in Volumio and 36 on my mobile app, so it looks as though the plugin has been updated, but the date is incorrect.