What do you mean by "reload" ? I just tried on iOS to "exit" the app (swipe up in task manager), restart the app: it kept showing me the chronological timeline, like I picked last time.
Also- this random behavior is totally different on my couple of alts on the same iOS app.
I have had the exact same discussion as we're having now many times since Twitter released the For You timeline. Never managed to pin-point to a specific behavior, everyone seems to get a different one.
Not surprised than Elon's Twitter's isn't better. In one hand I welcome their revert to tabs for "For you / Timeline", at least, it's easy to know you aren't reading the correct timeline…
Also- this random behavior is totally different on my couple of alts on the same iOS app.