Are they just bad now? The one I noticed was the "Kingdom" which is several years old. It had horrible subs because the sub were written by Chinese people using Chinese names for places and characters but the spoken language was Japanese. So the sub would say "General Mike is going to attack Houston" and the spoken Japanese would say "General Bob is going to attach Seattle" (fill in Mike and Houston with Chinese name…
More likely the translators, probably native English speakers, intentionally decided to use 'authentic', 'historical' Chinese names (as modern mandarn speakers would write them in pinyin) rather than the Japanese ones?
I agree that the effect could be really confusing though, and it's not what I would do!
(IIRC the fan translations of the Manga also gradually decided to change to use Chinese versions of the historical names, which I also found confusing - especially as they have kept some of the old Japanese names ones, so...it's a weird mix...)