Touch Sensor or Fingerprints sensor problem

From the last month, I noticed in my S10+ that my fingerprints sensor working automatically. That means if I open the keyboard to write something then it's automatically pressing the spacebar. I can't write any thing. If I am on the home screen then it automatically presses the app of finger sensor down the app. If I open the gallery then it automatically opens the picture which is in the fingerprint sensor area.

What is the cause of this?

Help me.