Hi, "http://www.novelupdates.com/series/isekai-no-mahou-gengo-ga-doumitemo-nihongo-dattaken/" newest chapter is wrong update. That newest chapter 90 should belong to "http://www.novelupdates.com/series/um-sorry-ive-been-reincarnated/" instead.
noted also you can use http://www.novelupdates.com/report-problem/ from NU next time ~ better, ask any available mod on nuf on his/her profile ~
thank you for pointing. I didn't think to check the user profile for the report problem link. So that's why i couldn't find it before.