Compare the permissions of the file when placed there by FTP. My guess is your FTP is putting different permissions on or is being put under a different group user owner.
anonymous_enable=NO
local_enable=YES
write_enable=YES
local_umask=0002
anon_upload_enable=YES
anon_mkdir_write_enable=YES
file_open_mode=0777
permittions on filefrom ftp: -rw------- 1 1001 201 11708 Sep 06 13:03 Pennyworth.S01E01.720p.rus.LostFilm.TV.mp4.torrent
from samba: -rwxr--r-- 1 99 201 17388 Aug 31 19:03 Pennyworth.S01E03.720p.rus.LostFilm.TV.mp4.torrent.added