The app requires that you actually open the post to mark as read I think, then there's an option at the top right to hide read. They don't seem to auto hide and they come back on refresh
Yeah I have noticed that, it seems to only buffer a certain number of posts at a time and will only hide ones that are buffered and marked as read. Also thanks I'm gonna find and apply that setting. There's enough duplication that I'm certain if I wanna see something again I will