Volume filling up but pgdata stays the same

[N3zeq]

Environment

• Platform: OpenShift
• Platform Version: 4.14.7
• PGO Image Tag: 5.5.2
• Postgres Version 15
• Storage: thin-csi (vsan)

##Question

I'm running crunchy Postgres 5.5 on openshift on an air gapped environment and I'm running into a very weird problem: my volume is constantly filling up, while my database size doesn't change and my wal files and logs are completely normal. Because I'm running in an air gapped environment I can't paste logs, but all logs on archive-push are returning successful completion. For example, when I run du -sh /pgdatait could return 800mb, but when I run df -h it sometimes returned up to 80Gi (and so did the pgmonitor metrics and the openshift metrics). I'll paste code from a smaller scale example:

[root@host ~]# df /mnt/sdf
Filesystem  1K-Blocks Used Available Use% Mounted on
/dev/sdf  15390744 564988 14117324 4% /var/mnt/sdf

[root@host ~]# du -sc /mnt/sdf/
285544 /mnt/sdf/
285544 total

And since it has even filled up more. Any ideas what could cause this issue?