acfs : free space from file-system but ASM disk full

Hello,

Diskgroups for ACFS are full from ASM side but not from filesystem side.

When i query asm db : :

     Group Group Name                State           Type      Total GB    Free GB

---------- ------------------------- --------------- ------- ---------- ----------

         4 ACFS                      MOUNTED         EXTERN          50          1

         5 ACFS_DATA                 MOUNTED         EXTERN         400          1

But with df -h linux command :

Filesystem             Size  Used Avail Use% Mounted on

/dev/asm/vol_dump-474  399G  4.4G  395G   2% /dump_oracle

acfsutil info fs /dump_oracle :

/dump_oracle/

    ACFS Version: 12.2.0.1.0

    on-disk version:       46.0

    compatible.advm:       12.2.0.0.0

    ACFS compatibility:    12.2.0.0.0

    flags:        MountPoint,Available

    mount time:   Thu Jun 28 10:26:19 2018

    mount sequence number: 2

    allocation unit:       4096

    metadata block size:   4096

    volumes:      1

    total size:   428422987776  ( 399.00 GB )

    total free:   423779524608  ( 394.68 GB )