Using GKE and helm stable/traefik.

When releasing to my cluster with a static IP for the loadBalancerIP I get the following error:

Error creating load balancer (will retry): Failed to create load 
balancer for service kube-system/rp-traefik: requested ip <my-ip> 
is neither static nor assigned to LB 
af5bfb5bd94a211e7adce42010a8e00e(kube-system/rp-traefik): <nil>

Three things seem important:

1. no matter how many times I run this (even after I've manually deleted all the LB's in my GCE. It always looks for LB af5bfb5bd94a211e7adce42010a8e00e. Where is this key coming from?
2. running gcloud compute addresses list shows <my-ip> as RESERVED so it should be available.
3. when I update the helm release values with a blank loadBalancerIP the af5bfb5bd94a211e7adce42010a8e00e LB is successfully created. When I change back to the static IP (after the target LB exists) it fails with the same error again.

I'm stuck. What would you check/try next?