Vmware Workstation Pro 12 on Ubuntu 16.04 memory issue

Hi all.
I have an issue with Vmware Workstation Pro 12 installed on Ubuntu 16.04.
My PC has 32 GB RAM and an i7 CPU.
I have create a VM with 16 GB RAM and 2 vCPU.
At power on of the VM I saw on my host so much shared memory that is allocated how much RAM is configured in the VM: 16 GB

before VM start
fra@K95VM:~$ free -hm
total used free shared buff/cache available
Mem: 31G 1,2G 28G 385M 1,6G 29G
Swap: 31G 0B 31G

after VM start
fra@K95VM:~$ free -hm
total used free shared buff/cache available
Mem: 31G 1,3G 12G 16G 17G 13G
Swap: 31G 0B 31G
fra@K95VM:~$

The problem is that I can not turn on another VM because I do not have enough memory available

I tried the same thing on Debian and the problem does not occur: I can start two VM each with 16 GB RAM and the host allocates memory when needed

I think the problem depends on the installed kernel version. Ubuntu 16.04 has the kernel 4.x while Debian has kernel 3.x

Does anyone have the same problem and/or a solution?

Thank you very much!