Issue with overlay space

i think there might be an issue with mounted drives as well
my fstab

config global
option anon_swap '1'
option anon_mount '1'
option auto_swap '1'
option auto_mount '1'
option delay_root '5'
option check_fs '0'

config mount
option target '/overlay'
option uuid '2c17596b-ae0f-4aa4-8e91-fec6cf5dc717'
option enabled '0'

config mount
option target '/rom'
option uuid '8cb90de3-eadd86b9-11c107b6-927f3d91'
option enabled '0'

config mount
option target '/mnt/sda1'
option uuid '8CB3-F55D'
option enabled '0'

config mount
option enabled '1'
option uuid '9dbc4223-a76a-2e43-baad-905b04b04c65'
option target '/mnt/usb2'

config mount
option enabled '1'
option uuid '05821d9b-1a09-4385-8e9d-9c43ac801832'
option target '/mnt/usb1'

drive space info

root@GL-MT6000:/overlay/upper/mnt/usb2# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                42.5M     42.5M         0 100% /rom
tmpfs                   494.7M     12.1M    482.6M   2% /tmp
/dev/loop0                7.2G      6.8G    354.2M  95% /overlay
overlayfs:/overlay        7.2G      6.8G    354.2M  95% /
tmpfs                   512.0K         0    512.0K   0% /dev
/dev/sda1                 4.3T      3.2T    969.0G  77% /mnt/usb1
/dev/sdb1                 4.5T      3.2T      1.1T  75% /tmp/mountd/disk1_part1
/dev/sda1                 4.3T      3.2T    969.0G  77% /tmp/mountd/disk2_part1
/dev/sda2               187.3G     29.2M    177.7G   0% /tmp/mountd/disk2_part2
/dev/sdc                  1.8T      1.6T     83.8G  95% /mnt/usb3

my issue here is that i dont see the mounted on for /mnt/usb2
and further more when i look at /overlay i see contents from all mount points

root@GL-MT6000:/overlay# ls
upper work
root@GL-MT6000:/overlay# cd upper/
root@GL-MT6000:/overlay/upper# ls
etc lib mnt usr www
root@GL-MT6000:/overlay/upper# cd mnt
root@GL-MT6000:/overlay/upper/mnt# ls
sda2 usb1 usb2 usb3
root@GL-MT6000:/overlay/upper/mnt# cd usb2
root@GL-MT6000:/overlay/upper/mnt/usb2# ls
gitrepos minidlna openwrt_backup shareroot torrent

after further investigation it seems like plugging in a new drive made usb2 go offline.
i believe this is why i have this mnt directory in overlay
can i delete it?

i ended up deleting
/overlay/upper/mnt folder and restarted
seems to have fixed the issue

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