help with the iPhone app

Anyone else using the app? I can't figure out why I don't get notifications any more, in the lock screen it comes up with a notification that someone has liked or responded, but then I have to troll through each post to find it, a few days ago, I could just dip into notifications and jump straight to it. Checked my setting on the desktop and it looks fine so I am out of ideas - apologies to anyone who I have ignored for the last week, it's not personal.......mostly.