Snapchat stuck on screen but only barely visible

So its hard to explain since english isnt my first language but pretty much i opened snapchat earlier and after closing it i opened twitter, i didnt notice anything at first but then i clicked on a tweet that was recently tweeted and it had no comments (im saying that it had no comments because the lower half of the screen was a dark grey/blackish color which is normal since i have it on night mode). anyways i looked down on the dark part of my screen and i see a white circle thats barely visible but i can still see it. after looking closer at it i see some other buttons from snapchat that are on my screen and they are visible on anything that i open as long as the app is dark enough where the white is visible. its almost like every app i use has a screenshot of snapchat at 20% opacity as the background. while writing this i looked again on my phone and i see that its less visible so im not sure if its going to go away or stay like this.