Cannot umount ntfs-36 with umount command

[dabicho]

Hello

I am having a problem with umountint an ntfs-3g mounted filesystem

This is the output I get from the commands

[siirfe at 010121 ~]$ mount /mnt/mac/
[siirfe at 010121 ~]$ mount |grep mac
/dev/sdb1 on /mnt/mac type fuseblk
(rw,nosuid,nodev,noexec,relatime,user_id=1002,group_id=1002,allow_other,blksize=4096)
[siirfe at 010121 ~]$ umount /mnt/mac/
umount: /mnt/mac: umount failed: Operation not permitted
[siirfe at 010121 ~]$ grep mac /etc/fstab
/dev/disk/by-label/SIIRFE_MAC     /mnt/mac   auto
iocharset=utf8,noauto,user 0 0
[siirfe at 010121 ~]$ grep mac /etc/mtab
/dev/sdb1 /mnt/mac fuseblk
rw,nosuid,nodev,noexec,relatime,user_id=1002,group_id=1002,allow_other,blksize=4096
0 0
[siirfe at 010121 ~]$ fusermount -u /mnt/mac/


fusermount -u works correctly

What is going on here? what am I missing?
I don't use gnome nor kde

I appreciate any input. Thank you