Pool unbalance Connections

Hi, I have a VS with persistence source address and a pool with round robin, this pool have two member. The function of this VS is provide to internal user output to internet.

Some days ago, the connection distribution it was unbalanced, 35.000 connection in a pool member and only 3000 in the other.

I think the connections may be going through a proxy , but have not found evidence of this. I try to change the mode balancing Least connection (member) , but i got the same result.

Someone has happened something like this, if so, how it has solved?.

Thank you very much. Greetings. Oscar.