ceph df (octopus) shows USED is 7 times higher than STORED in erasure coded pool

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The pool *default.rgw.buckets.data* has *501 GiB* stored, but USED shows *3.5
TiB *(7 times higher!)*:*

root@ceph-01:~# ceph df
--- RAW STORAGE ---
CLASS  SIZE     AVAIL    USED     RAW USED  %RAW USED
hdd    196 TiB  193 TiB  3.5 TiB   3.6 TiB       1.85
TOTAL  196 TiB  193 TiB  3.5 TiB   3.6 TiB       1.85

--- POOLS ---
POOL                       ID  PGS  STORED   OBJECTS  USED     %USED  MAX AVAIL
device_health_metrics       1    1   19 KiB       12   56 KiB      0     61 TiB
.rgw.root                   2   32  2.6 KiB        6  1.1 MiB      0     61 TiB
default.rgw.log             3   32  168 KiB      210   13 MiB      0     61 TiB
default.rgw.control         4   32      0 B        8      0 B      0     61 TiB
default.rgw.meta            5    8  4.8 KiB       11  1.9 MiB      0     61 TiB
default.rgw.buckets.index   6    8  1.6 GiB      211  4.7 GiB      0     61 TiB

default.rgw.buckets.data   10  128  501 GiB    5.36M  3.5 TiB   1.90    110 TiB

The *default.rgw.buckets.data* pool is using erasure coding:

root@ceph-01:~# ceph osd erasure-code-profile get EC_RGW_HOST
crush-device-class=hdd
crush-failure-domain=host
crush-root=default
jerasure-per-chunk-alignment=false
k=6
m=4
plugin=jerasure
technique=reed_sol_van
w=8

If anyone could help explain why it's using up 7 times more space, it would
help a lot. Versioning is disabled. ceph version 15.2.13 (octopus stable).

Sincerely,
Ark.
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