I set it two years ago too, and then a couple months ago they changed the app and again tried to foist it on me twice. I changed back twice, and had it changed once again - this last time seems to have stuck. I have another Twitter account (newer) that I don't log into frequently and it's happened on that one 3 times for a total of 6 between my two accounts. Oddly, I have one biz account that's never changed.

it’s not chronological until you disable retweets and adverts - i use a plug-in to ensure this - makes it much better.