Duplicate EC2 instances getting launched

Terraform Providers AWS
1

This is my first post here, so Ignore if you find anything inconsistent with the forum.

Has anyone observed this issue where Terraform Created Duplicate EC2 instances with same name?
I just today observed i had created 15 terraform templates for 15 EC2 instances and I had 30 instances running with 2 instances having same name?

Can anyone point out why is this happening?

Terrraform Version:

Terraform v0.13.7
+ provider registry.terraform.io/hashicorp/aws v4.11.0
+ provider registry.terraform.io/hashicorp/null v3.1.1
+ provider registry.terraform.io/hashicorp/template v2.2.0

Sample Terraform Template

data "template_file" "instance" {
  template = file("userdata_proxy.sh.tmpl")

  vars = {
    log_server          = "<server>"
    log_server_port     = "<server_port>"
    CLUSTER_NAME        = "<cluster_name>"
    CONTAINER_NAME      = "<cluster_name>"
    env                 = "<env>"
    group_name          = "<group>"
    service_name        = "<service_name>"
    region              = "us-east-1"
    influx_url          = "<influx_url>"
    influx_app_url      = "<influx_url>"
    influx_pass         = "<influx_pass"
    influx_rp           = "1y"
    influx_app_rp       = ""
    influx_database     = "<influx_db"
    influx_username     = "<influx_user"
    role                = "<role>"
    CDEF                = "<cdef>"
    proxy_id            = "<id>"
    cluster_id          = "<cluster_id>"
    cloud_fqdn          = "<cloud_fqdn>"
    hostname            = "<hostname>"
  }
}

resource "aws_instance" "instance" {
    ami                    = data.aws_ami.ami.image_id
    instance_type          = "c5.2xlarge"
    key_name               = "<key_name>"
    subnet_id              = "<subnet_id>"
    vpc_security_group_ids = [data.aws_security_group.sg.id]
    iam_instance_profile   = "<iam_instance_profile>"
    user_data              = data.template_file.instance.rendered
    
    root_block_device {
      delete_on_termination = true
      volume_type           = "gp3"
      encrypted             = true
    }

    tags = {
      < tags >
    }
}

resource "null_resource" "create_tags_instance" {
  
  triggers = {
    instance_id = aws_instance.instance.id
  }

  provisioner "local-exec" {
    command = <<EOT
    ResourceId=$(aws ec2 describe-volumes --filters Name="attachment.instance-id",Values="${aws_instance.instance.id}" --profile <profile> --region us-east-1 | jq -r .Volumes[].VolumeId) && \
    aws ec2 create-tags --profile <profile> --region us-east-1 --resources $${ResourceId} \
    --tags Key="Name",Value="<value>" 
   EOT
  }
}

data "aws_eip" "eip_instance" {
  public_ip = "<eip>"
}

resource "aws_eip_association" "eip_association_instance" {
  instance_id   = aws_instance.instance.id
  allocation_id = data.aws_eip.eip_instance.id
}```