uname -a
Linux myArchLinux 6.7.4-arch1-1 #1 SMP PREEMPT_DYNAMIC Mon, 05 Feb
2024 22:07:49 +0000 x86_64 GNU/Linux

btrfs --version
btrfs-progs v6.7

btrfs fi show
Label: 'myArch'  uuid: 532916ce-b32c-4009-a0e6-93e73363d7e7
        Total devices 1 FS bytes used 334.12GiB
        devid    1 size 452.16GiB used 452.16GiB path /dev/nvme0n1p3

btrfs fi df /
Data, single: total=419.08GiB, used=331.38GiB
System, DUP: total=32.00MiB, used=80.00KiB
Metadata, DUP: total=16.51GiB, used=2.73GiB
GlobalReserve, single: total=512.00MiB, used=0.00B

Above is after rebooting and before balance. Then I do btrfs balance
start -musage=50 /, I got:
Done, had to relocate 27 out of 453 chunks
btrfs fi df /
Data, single: total=419.08GiB, used=331.39GiB
System, DUP: total=32.00MiB, used=80.00KiB
Metadata, DUP: total=15.51GiB, used=2.73GiB
GlobalReserve, single: total=512.00MiB, used=0.00B

My dmesg log is attached. Thanks for reading my report.