Keyboard problem.
When I type something in my keyboard and specially when I type A key it may stuck and stay lagging from itself , it's not a Software issue but it is a hardware issue.
MacBook Pro 13”, macOS 10.15
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You do not say what exact Mac this is ...
How to clean the keyboard of your MacBook or MacBook Pro ...
if no resolve
See if you qualify here: https://support.apple.com/keyboard-service-program-for-mac-notebooks