MBP Late 2016 — Butterfly keyboard's key double hit problem
I recently got a new Macbbook Pro. Problbem is what you're exactly seeing here and it's specific to the bb key.
I touch it once and it puts two b characters for me most of the time, but not always. This key is much looser and more sensitive than the others.
Suggested by @pydev, I removed the key cap. It does work flawlessly without the key cap. But when I put it back, same old story.
Update: Here's a software solution working around the problem.
Update: Apple has announced a MBP Late 2016 — Butterfly keyboard's key double hit problem for macbooks with butterfly keyboard.