A short while ago I re-gripped my putter. Coincidentally or not, at around the same time, my puttinf went from my normal of 33-34 putts per round to 44-46!!!

Yesterday, I went to a practice green and dropped a bunch of balls in a circular pattern around a hole with distances varying from 3 to 10 feet. With my normal hand grip (Right hand down, left index finger resting on top right hand pinky) I was pushing almost every putt wide right.

After a while I took my left hand off the putter, gripped the putter with my right hand only, and ran my right index finger down the shaft to stabilize the putter. I putted again. But this time most of my putts went in. It appears that my left hand is not remaining passive throughout my stroke!

My question is: Is it possible that the new grip (fatter) is responsible for this or could this be just a coincidence?

And no, I am not interested in one hand putting or gripping a different way such as left hand low, or chaning my putter to a belly putter...

Thanks