Similar issues: Transliterations switch off across all LingQ, and still getting Transliteration in Review cards:
https://forum.lingq.com/t/please-make-it-possible-to-turn-off-korean-transliteration-on-word-cards/68212/16?u=jpp025 — Response #16
https://forum.lingq.com/t/please-make-it-possible-to-turn-off-korean-transliteration-on-word-cards/68212/18?u=jpp025 — Response #18