Like when I'm on snapchat watching stories it will click and then take me back to the take a picture section/screen on snapchat without me tapping anything. Can someone please help?
Unfortunately it sounds like your Note 9 might have a bad Screen Digitizer. A little over 5 years ago I had an HTC Evo that started clicking on and selecting things itself and started typing on its own. At the time I was convinced that someone had hacked my phone, but it turned out that the phone had a bad Digitizer.