idk if this helps but my acc is also from 2017 and what i observed is that, the series i already got back are series that i've marked as "already read" on 2017-2018. i also saw my list updating in real time, so i assume "chronogical order" means mostly the library chronological order rather than an account's chronological order, and probably updating from "already read" > "now reading" > "want to read". cmiiw tho

« Chronological order » my ass bro my account is from 2017 and I don’t have a single thing back