Is the option shown below also on? If so then the format in the Default Lister is ignored and you should follow the Folder Formats FAQ to set the format(s) you want for your folder(s).
(Having that option on actually simplifies things as you don't have to worry about the Default Lister opening with one format and then having another format used when you change directories. I keep forgetting the option is there, though! Apologies.)
