AWS services cost depend on the region, generally it is less expensive in us-east-1.
For EKS you pay for the EKS dashboard even if the EC2 instances are down. (go to EKS and see if you still have your cluster)
Data transfer fees are there because you have more than 1 node in multiple AZs
Active region does not means you have service deployed there, in the cost explorer you can check cost per region.
Make sure to run terraform destroy and read the terraform plan to see how many resources were created and how many were destroyed.
You can go service per service and clean up manually in AWS console (which I don't recommend because those resources was created using terraform).
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