Disk exceeding boot size?

Hi

I got a guest VM that runs an NFS server. I have given it a 750 GB boot disk, but when I check the disk size in local-lvm it says the VM disk size is 805 GB.
In the guest OS, the VM still has ~45 GB of free space. So why is the VM disk so big on the local-lvm?

My issue right now is that the local-lvm is full, and one VM gets I/O error when booting up.

I carefully planned my VM disk sizes, and even left some for spare by only going for 750 GB on the NFS server. And yet I have somehow...

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