I managed to resolve the issue
after scanning through all my arcade platform edit window i noticed that all playlist in the arcade section on recreating playlists had added the word Arcade infront of all of the generated playlists for example
Unique Name. Arcade Irem Classics
Nested Name. Irem Classics
so bigbox was following the unique name and shifting everything to the top following Arcade so i changed it to
Unique Name. Irem Classics
Nested Name. Irem Classics
and everything now lists correctly in LB\BB
i hope this may help anyone else experiencing a naming problem and platform shift