about the file scan in the mac osx with duplicated problem

first, I am very appreciate to use plex for my media server, it is very powerful.
but when I add the library as below, it match the TV shown to duplicate, I have try many times, it still the same。
as shown below, there are 6 seasons in the folder. but when I add them to the library, there are only 4 season folders

as shown below, only season1,4,5,6

and in season 1, there are 3 duplicate files for each

in the attribution of each episode there are 3 files as below

now I am very cray for this, how can I solve it.
please help