When I fit the phonons with epw, the problem appears at the Gamma point as shown in the figure, I don't know the exact reason, even if I calculate the BN column in "school 2021" the same result appears. Any replies or suggestions would be helpful, thanks!
![Image](%5Battachment=0%5D%E6%9C%AA%E5%91%BD%E5%90%8D%E5%9B%BE%E7%89%87.png%5B/attachment%5D)