GA4: Why is Life cycle menu appearing twice

The lifecycle menu is appearing twice and is duplicated. Initially, I suspected that this might be due to the implementation of two data streams, but it doesn't seem to be the root cause. Has anyone else encountered this issue?

I haven't experienced that problem. Have you considered checking the Library to see if there might be a duplicate that you can either deactivate or delete? Alternatively, is there only one instance of it in the Library?