Something is limiting free space

running nextcloud inside a docker container or raspberry pi 4,
/var/www mounted to /disk/nextcloud.
/disk is mounted hdd with 1 tb

And nextcloud says that it is out of free space after i uploaded 1 gb of files. It is not a problem with alllowed space bc i uploaded as admin and have unlimited space and It is not a problem with hdd being full bc it is literally empty and i can scp huge file into it.
There is also this thing inside server settings in web gui and it drives me crazy
wtf
wtf is used space, it doesn’t change when i upload/delete files as well as free space

sudo lsblk -f
NAME        FSTYPE FSVER LABEL      UUID                   FSAVAIL FSUSE% MOUNTPOINT
sda
└─sda1      ntfs         New Volume 7C7C5ED27C5E86B4        928.5G     0% /disk

sudo df /disk
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/sda1      976760828 3174140 973586688   1% /disk

As far as i know docker doesn’t limit the space inside the container, so what limits it?
oh yeah, and when i scp’d said file into /disk/nextcloud/data/admin/files this web gui showed me negative free space

Am I dumb and doing something completely wrong or is there a “limit disk usage” option i didn’t find?

ok, I formatted my drive to ext4 and everything seems to work now