Different readouts between XOA and Htop?

Why is there such a big difference between a VM RAM usage readout on the “stats” page in XOA and HTOP on this same VM ?

am I doing something wrong ?

I have never really gave this much attention, but I am seeing the same thing. File a bug report.

yeah, but which of the 2 would be actually right then ?

I would trust the tools running in the VM.