You upload some files on a Linux server and after that you cannot move or delete them despite the permissions are ok.
This may happen because such files have a space as first character in their name. There is no solution. Filezilla says its a problem of some servers and not of their client.
Hoping you have access to a Linux terminal, you can remove the leading space this way:
rename "s/[ ]//g" *
If you cannot write the command line because you can't access the terminal, but your hosting service has a html/ajax file manager, you can try from there.