Appian Cloud Server Configuration

Hi All,

We currently have 3 servers in our production environment hosted in appian cloud. Server 1 is having memory used % of 69%, server 2 is having around 59% and server 3 is having around 60%. Any reason why the memory usage is not symmetrical, I mean why they are not much closer to each other(server 2 and 3 are close but 1 is little high). Any idea how these are handled? Any suggestions would be helpful.