Two suggestions to try...
1) If you’ve not already done so, update to iPadOS 13.6 - this being the current version of iPadOS.
2) Perform a force-restart of your iPad - as this will often clear an unexpected malfunction:
- On an iPad with a Home button: Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.
- On an iPad with Face ID: Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the top button. When the Apple logo appears, release the button.
I hope these suggestion prove to be helpful - and perhaps resolve the issue.