'Longhorn Volume a lot bigger than mounted drive

I have a small InfluxDB database running inside my K3S cluster.
As Storage Class I use Longhorn.
I know it's not optimal to run a database in Kubernetes, but this is only for some metric logging for Telegraf.
The problem is that in the pod the mounted volume is 200 MB big, but in Longhorn it's 2.5 GB big as actual size. The volume is only 1 day old. At this speed, my disk storage will be full soon.

Why is this? And is this something I can fix?



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