Seafile 9.0.6 and space used

Good afternoon, everyone. Strange situation, OS opensuse
Web interface show me
Used space
53.7 GB
but in console i see
/dev/sdb1 100G 65G 35G
./ already used
filesystem BTRFS
Libraries / Files
52 / 119
any ideas?

This is no odd situation. There are several similar posts in the forum and every time an answers is provided.