EKS install seems not respect the region requested

I was wondering if it is a bug or normal that if I require a us-east-1 EKS cluster, it seems that us-west-1 region is being used?

Notice the arn:aws:cloudformation:us-west-2 resource prefix even though I have requested a us-east-1 region.

(Ignore the actual error as it is tracked in another discussion).

Error creating stack: error creating master: AccessDenied: User: <redacted> is not authorized to perform: cloudformation:CreateStack on resource: arn:aws:cloudformation:us-west-2:617256414652:stack/c-tdhj8-eks-vpc/* status code: 403, request id: <redacted>; waiting on cluster-provisioner-controller