Increase Disk for Gitlab with Kubernetes

I have setup gitlab with helm and set gitaly.persistence.size=150Gi. When I check the generated aws ebs size it matches the claimed 150Gi. Checking the Statefulset of gitaly I also see the 150Gi

volumeClaimTemplates:
  - apiVersion: v1
    kind: PersistentVolumeClaim
    metadata:
      creationTimestamp: null
      labels:
        app: gitaly
        release: gitlab
      name: repo-data
    spec:
      accessModes:
      - ReadWriteOnce
      resources:
        requests:
          storage: 150Gi
      volumeMode: Filesystem
    status:
      phase: Pending

When I check the stats in System Info of Gitlab, it shows me strange numbers.
50GB max disk and current usage 21.9GB. I would have expected 150GB and the current usage close to 0GB, because it is a fresh clean installation.

Does anyone have a clue what I am doing wrong?