3 wan connection . 1 external ip address

Hello

i have a problem and i want to know if there any solution for that

i manage successfully make 3 wan connection merged as in one speed for download and upload

but the problem is that if i see my ip address over web it’s changed every second to different ip address. because each wan had their real ip address

and this is bad for some website that detect ip address cookies for login to portal and other forms

so is there any way that i can make just one ip address work over web not the other two addresses ?

here is my config

http://pastebin.centos.org/26841/96817143/