I'm in the US. And KDramas don't show up prominently in my recommendations (I prefer watching on KissAsian - force of habit and the subs are better).
The algo is heavily targeted to your own assumed tastes. The one time I did watch one, it was in Korean with English subs.
Maybe you watched a western marketed KDrama like Squid Games? Try watching Beyond Evil, Itaewon Class, Reply 1988, or Mr Queen and see if it reverts to English. I'm kinda curious now
That’s normal. You have to match appropriate sentence length in dubs otherwise when another person is taking the wrong person will still be talking in the dubbed language. Subtitles allow for better translation as that limitation isn’t there
Netflix added KDramas in order to help it pivot into the Asian market. Most viewers will be watching the shows via subtitles.