proxmox load all mem

I´m using the newest proxmox.. and have 64GB memory. i have 2 computers on it. 1x 6GB 1x 2GB Still it use 22GB memory and grows more and more. when i reboot. it uses around 10GB. i hade 32GB innit before and it almost eat it alive! Is there something wrong if proxmox load on memory or a bug...