The amount of memmory in use is found by looking at the VM's on the host and adding the assigned memmory of each VM on that host. Then calculating it to percentage. On the other hosts it worked. I have also moved memmory heavy VM's from that host and the memmory percentage in use didn't change. It got higher on the host I moved it to.
For some reason that host isn't able to show any performance data - maybe that is the problem ? If that might be the issue how do I resolve this ?