Blade 3 seems to have only 16 GB of RAM than 32

I’ve just found out that the Blade 3 nodes I’m using in my Cluster Box only has 16 GB of usable RAM, whereas I had ordered them with 32 GB:

root@blade3:/# free -t
               total        used        free      shared  buff/cache   available
Mem:        16330604      649712    15424416        2404      417924    15680892
Swap:              0           0           0
Total:      16330604      649712    15424416

Why? I’ve now got the Debian Bookworm distro you supply for use in a Blade 3 with Cluster Box.