Why is my keyboard acting weird with shift input not being detected with Windows 11?

My keyboard is suddenly acting weird. I am using Windows 11. Certain combinations stopped working when using Shift , but then resolve when I use the other key. For example, if I pressed left- Shift a then nothing happened. I tried dozens of times but once I pressed right- Shift a then the capital “A” did come and suddenly left- Shift worked as well. Same for the “@” sign ( Shift + 2 ) but in reverse, right- Shift did not work until I first did a left- Shift . What can explain such odd behavior? The keyboard is about 2 months old, the PC less than a year.

Question by A.bakker on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.