Load Balancer Stickiness


We deployed Rancher LB on many host and set the Stickiness conf with cookie.
Our problem is depending on which host catch the request, it give it a different cookie.

Ex : request 1 arrived, LB on host 1 give it a cookie => We can see cookie A in the browser
request 2 (sent with cookie A) arrived on LB on host 2 => LB of Host 2 give to the request a new cookie

If req 1 and 2 arrived on the same LB/Host, then cookie is the replaced.

Any idea ?