My finger went numb occasionally when I was shooting with a thinner glove. When I switched to a thicker glove, I didn't have that problem. Over time, I have developed a sort of callouse on the tip of the middle finger, so I can now shoot with the thinner glove again, if I want to.
I wouldn't keep shooting with a numb finger, as that indicates nerve damage. When the finger recovers, try a thicker glove for a while.