Why do symlink names have a question mark at the end and why don't they work?

Question

bash

Made a script

#!/bin/bash
#удаляем старый плейлист
rm /home/osmc/.kodi/userdata/playlists/video/playlist.m3u
#очищаем дирректорию с ссылками
rm /media/FLASH/links/*.mkv
#переменная с путем к файлу от отдела маркетинга
file="/home/osmc/file/file.m3u"
#переменная для именования ссылок
let s=1
#меняем слеши в путях
sed -i 's/\\/\//g' $file
#подстановка правильно пути
sed -i 's!L:/files!/media/FLASH!' $file
#начало построчного чтения файла
while read line
        do
          #проверка того, что строка - путь
          if 
          then
                #создание ссылки
                ln -s $line /media/FLASH/links/$s.mkv
                #запись пути ссылки в плейлист
                echo /media/FLASH/links/$s.mkv >> /home/osmc/.kodi/userdata/playlists/video/playlist.m3u
                let s=s+1
          else
                #запись атрибутов в плейлист
                echo $line >> /home/osmc/.kodi/userdata/playlists/video/playlist.m3u
          fi
        done < $file

Its essence is to get an intermediate playlist from windows, replace the paths, symlink with each path / file and add them to the final playlist.
I create a playlist in vlc, copy it, run the script, it seems to work correctly, but symlinks do not work.
The output of ln -l shows the following.

Actually the question is why there is a question mark at the end of symlink names and why they don't work?
Despite the fact that if you manually create, everything is OK

Answer 1

why do symlink names have a question mark at the end and why don't they work?

Because you read such file names from $file with the read statement:
That's why they don't work, because some kind of garbage at the end. show what it outputshexdump -Cv $file