ios_template making changes when router config already exists

deploy_tunnel.yml

#!/usr/bin/env ansible-playbook

- name: Deploy DMVPN tunnels
  hosts: dmvpn
  gather_facts: no
  connection: local
  vars_files:
    - vpn_vars.yml
  roles:
    - deploy_tunnel

roles\deploy_tunnel\tasks\class_r1.yml

- name: Deploy tunnels to class 1 routers
  ios_template:
    src: class1_r1.j2
    provider: "{{ cli }}"

roles\deploy_tunnel\tasks\main.yml

- name: "Include {{ dev_role }} tasks"
  include: "{{ item }}"
  with_first_found:
    - files: "{{ dev_role }}.yml"
      skip: true
      paths: tasks

roles\deploy_tunnel\templates\class_r1.j2

{% for vpns in router_vpns %}
!
interface Tunnel{{ VPN[vpns]['pri_tunnel'] }}
 description {{ vpns }} primary tunnel
 ip vrf forwarding {{ vpns }}
 ip address {{ ip.pri_tunnel }} {{ dmvpn_mask }}
 no ip redirects
 ip mtu 1400
 ip nhrp authentication {{ VPN[vpns]['pri_tunnel'] }}
 ip nhrp map multicast {{ ip.pri_hub_loopback }}
 ip nhrp map {{ ip.pri_hub_tunnel }} {{ ip.pri_hub_loopback }}
 ip nhrp network-id {{ VPN[vpns]['pri_tunnel'] }}
 ip nhrp holdtime 360
 ip nhrp nhs {{ ip.pri_hub_tunnel }}
 ip nhrp shortcut
 ip tcp adjust-mss 1360
 load-interval 30
 delay {{ pri_delay }}
 qos pre-classify
{% if vpns == primary_customer %}
 tunnel source Loopback1
{% else %}
 tunnel source Loopback2
{% endif %}
 tunnel mode gre multipoint
 tunnel key {{ VPN[vpns]['pri_tunnel'] }}
interface Tunnel{{ VPN[vpns]['sec_tunnel'] }}
 description {{ vpns }} primary tunnel
 ip vrf forwarding {{ vpns }}
 ip address {{ ip.sec_tunnel }} {{ dmvpn_mask }}
 no ip redirects
 ip mtu 1400
 ip nhrp authentication {{ VPN[vpns]['sec_tunnel'] }}
 ip nhrp map multicast {{ ip.sec_hub_loopback }}
 ip nhrp map {{ ip.sec_hub_tunnel }} {{ ip.sec_hub_loopback }}
 ip nhrp network-id {{ VPN[vpns]['sec_tunnel'] }}
 ip nhrp holdtime 360
 ip nhrp nhs {{ ip.sec_hub_tunnel }}
 ip nhrp shortcut
 ip tcp adjust-mss 1360
 load-interval 30
 delay {{ sec_delay }}
 qos pre-classify
{% if vpns == primary_customer %}
 tunnel source Loopback3
{% else %}
 tunnel source Loopback4
{% endif %}
 tunnel mode gre multipoint
 tunnel key {{ VPN[vpns]['sec_tunnel'] }}
{% endfor %}
end