S-planner notifications don't make sound

S-planner notifications don't make sound
So yesterday I had a s-planner notification go off and pressed some button in my pocket. When I got my phone out it said that it muted notification sounds. How is that even possible on the notification screen? I tired to reconstruct it and pressed everything on my phone while an alarm got off but I only can change the volume of my ringtone.
And now I can't get s-planner notification to make any noise. In the sound settings s-planer really was set to...

S-planner notifications don't make sound

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