Samba Applying Permissions only to certain file types?



I have Debian running with Samba and sharing with OSX.

For some reason, Samba is assigning a different permission level to certain files (PDF's GIF's, Jpegs, etc) and other permissions to movie files (M4V, FLV,etc) when they are created.

I cannot find why it is doing this and it is breaking my setup!

The permissions being assigned to the documents and pictures are: -rw-r--r--
The permissions applied to movie file types are: -rw-r-----

I can manually use chmod 644 on the files and they work properly, I would prefer not to do this.

Below is the share config from the smb.conf file.

comment = TEST
path = /var/www
valid users = user
writeable = yes
browseable = yes
force create mode = 0644
locking = yes