Yeah, Twitter switched to an algorithmic feed in 2016 [1]. There is an option to turn off "Show the best Tweets first," but I don't know if that will actually cause the entire feed to be chronological.
An annoying thing about Twitter that I experienced recently is I started getting notifications for "top Tweets." I had to tell Twitter multiple times that I didn't want them before they stopped (there was no option to put an immediate stop to them).
[1]: https://www.nytimes.com/2016/03/22/technology/personaltech/p...