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Apologies for the delayed response. We only just now got to this thread. The Daily Mixes get grouped according to different aspects they have in common. So it's possible that at one point English and Russian songs are grouped in to one and at other times - in to different playlists. The more varied music you listen to, like / hide, the better the algorithms adjust to your taste and the personalized content gets updated. So the best thing to do is to keep expanding your music library 🙂
Hope this shines some light on the matter. Keep us posted if you have further questions.
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“Music is a language that doesn’t speak in particular words. It speaks in emotions, and if it’s in the bones, it’s in the bones.” - Keith Richards