Difference in memory utilization top vs vmware

Greetings all;
Have encountered an issue, according to top one of our Redhat 6.8 vm's is reporting 16gb memory available, 16gb memory used. 156164k free, 722480k cached, swap 2.6gb allocated 2.6gb used. Meanwhile VMware performance monitor is reporting memory utilization at 25% for the last month. My question is why the difference in memory reporting. Upon rebooting the vm, the output from htop and top reveal memory utilization nearly equal to what VMware is reporting.

Thank you for any and all input

Norm