Issues in EKS is causing new EC2 instances to spin off

I had created EKS cluster with 4 nodes using CLI. the cluster was visible from Management console and 4 EC2 instances was launched. Then i deleted the Kubernetes cluster from Console. It is not showing in Console now. However the 4 EC2 instances continues to exists. if i terminate, it continues to create new EC2 instances. Looks like a defect but i am not sure how to stop those EC2 instances from launching . Also, the billing is going up as the 4 instances are running. Any help on this pls. Thank you.