My frames keeps duplicating every time I try to make one

Hello, when I press Alt + N it makes a new frame, which is what I want, but for some reason it keep duplicating the previous one, I know I could just press Alt + B to make an empty frame, but one of my layer is a linked cell and creating an entirely empty frame destroys the link. Please forgive me as I’m just a new user, thanks.

the linked cells are only meant to be used to extend a keyframe, of course making a different frame will break the link