Serious gaming issue

Thank God it's not just me! I am honestly surprised this happens to someone else.

That's really weird. You might wanna get that checked out.

Poor blood circulation in the hands. That'd be my guess.

Also happens to me, it's weird it's only the index finger always

As boredatwork said, it's the blood circulation. Lack of blood makes you cold. That's why frostbite kicks in