Metal fans who listen to things beyond the mainstream hits tend to listen to a lot of music in languages they don't speak due to how much of the best metal out there isn't in English. If you listen to a lot of bands whose fans listen to music in other languages then I'd expect you to get a lot of recommendations in other languages.

I understand why it happens, but it doesn't mean I want it to happen. Unfortunately, this is a case where a recommender system runs into issues. Outside of these songs, I likely overlap a lot with the people who are okay with non English recommendations.