Is your app up to date? I have it on my iPhone, iPad, and an Android device which all have no problem always remembering the "Following" tab selection. As well as desktop/web.
Says the one who cared to comment in the first place, 16 days ago and you getting angry after taking a simple joke too seriously after the fact that Twitter open sourced it's algorithm.
HNer's like you just make me laugh all the time with silly replies like that just being unable to cope.