Terraform plan picking up changes on each run without any changes in code

I am using Nomad terraform module with terraform 0.12 and although it’s able to provision the cluster successfully . It’s changing the plan on each run without any code changes in terraform .
It’s removing the instances from load balancer and attaching again on alternatively in each apply .

The changes are happening in

module.clients.aws_autoscaling_group.autoscaling_group

with the target group arns and load balancers .