If you are experiencing unwanted double coding or key bounce, try adjusting the Repeat Delay and Repeat Rate parameters in your operating system.
In Windows, to check this, please navigate to:
Control Panel > Ease of Access Center > Change how your keyboard works
Control Panel > Keyboard
From here, you should see sliders for Repeat Delay and Repeat Rate.
Set Repeat Delay to Long
Set Repeat Rate to Fast
Now test the key that was previously double coding.
If this resolved your issue but you use the Repeat feature frequently, you may consider decreasing your Repeat Delay incrementally.