Keyboard pops up when I press home button

I had the same problem. What I think triggered it was I was using Google Keyboard. Then, later when I accessed Secure Folder (Google Keyboard was not installed in Secure Folder), the phone switch to Samsung Keyboard. I think something was left out of sync and I had the same problem you did.

What fixed it was: 1) installing Google Keyboard in Secure Folder and 2) restarting the phone.
 

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