Discrepancies with root file system space reporting

df -h shows my root directory with 109G used. fastfetch/hyfetch shows 108.52 GiB used.

And honeyfetch shows 153.67 GiB used. Now, this was the case before I did some garbage collection on my NixOS installation and running nix-store --optimise

The hardware is a Tuxedo Pulse 14 Gen4 laptop. Running NixOS 25.05 using a standard configuration file and not a flake just yet. I doubt that matters, but just wanted to be precise. And I can send you screenshots if you want.