Pool round-robin load balancing not balanced

I have a simple pool created with 4 Linux web servers in it. (running version 10.2.1) Two of the webservers are physical machines, and two are virtual.

 

I have selected round-robin as the load-balancing method, disabled priority group activation, and the ratios for each member in the group is set to 1, connection limit for each member is set to zero.

 

Whenever I look at the statistics, the physical servers are getting about 6 to 8 times the connections of the virtual machines.

 

The physical machines do have more memory then the virtual machines, but I've verified the virtual machines have plenty of free memory available, and the load average is roughly the same across all the servers.

 

So I have no idea why the Virtual Machines have such a low connection count as compared to the physical machines. I've checked the apache configs and made sure the number of servers, threads, etc are set to be the same across all machines.

 

Any clues or things I should check for to verify the round-robin is working as expected, or is this a bug or expected behavior?

 

Thanks,