Behind the nut ringing but only on G string

Hi guys, I recently acquired a Sabre which I love! The neck is amazing. However, The owner had 10’s on it which I did not like. I switched em to 9-46s, fine, but the next day somehow behind the nut started ringing, i thought it must have been because i moved down in gauge, I just ordered 10’s put em on and now the g string is ringing only. I thought there may have been something in the nut so I took a guitar pick and didn’t file with it, just tried to move stuff out, and now its also buzzing…

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