Multiple sources from my receiver to multi zone speakers solution

Configuration
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1

Hi guys,
I want to create a script that will be playing spotify on multiple speakers in my house.
I almost succeeded but not enough.

I have two scripts, first script is a ‘main’ script and it sits on lovelace UI called:
Play spotify on multiple speakers

and I made input variables to it:

alias: Play spotify on multiple speakers
icon: "mdi:party-popper"
description: 'Play spotify on multiple speakers'
fields:
  source_avr:
    description: 'The avr zone/speaker that will reproduce sound'
    example: media_player.avr_zone1, media_player.avr_zone2
  source:
    description: 'Selected source for ceiling zone speakers'
    example: HEOS Music
  volume_avr:
    description: "sets the volume on the avr"
    example: '0.6'
  speakers:
    description: 'Media player(s) that will be playing - ONLY IF ZONE2'
    example: media_player.bedroom_ceiling_speaker, media_player.hallway_ceiling_speaker, media_player.bathroom_ceiling_speaker, media_player.office, media_player.office_shelf_speakers
  volume_speaker:
    description: "sets the volume on the speaker"
    example: '0.52'

sequence:
#First, turn on and set up HEOS on Denon AVR
  - service: script.turn_on
    entity_id: script.set_avr
    data:
      variables:
        avr_media_player: "{{ source_avr }}"
        volume: "{{ volume_avr }}"

# Second, turn on all media_players (multiple zone speakers) and set the appropriete source
  - service: media_player.turn_on
    data:
      entity_id: "{{ speakers }}"

  - service: media_player.select_source
    data:
      entity_id: "{{ speakers }}"
      source: "{{ source }}"

as you can see, I have a second inner script called set_avr which is turning my denon avr both zones (zone1 and zone 2), and there I have a bug. It turns both zones, firstly it turns zone1 with volume 0.5, then it runs zone2 with volume 0.5, but it sets volume for zone1 to 0

alias: Set AVR
icon: "mdi:party-popper"
description: 'Sets AVR to different zones and sources'
fields:
  avr_media_player:
    description: "gets the correct zone player for avr"
    example: media_player.avr_zone1, media_player.avr_zone2
  volume:
    description: "sets the volume on the avr"
    example: "0.4"
  source:
    description: 'Correct source for playing audio - amplifier sources - AUX1,AUX2,Blu-ray,Bluetooth,SBB BOX,CD,DVD,Game,HEOS Music,Media Player,TV Audio,Tuner'
    example:  HEOS Music

sequence:
  # - choose:
  #   - conditions: "{{not is_state(avr_media_player,'on')}}"
  #     sequence:
  - service: media_player.turn_on
    data:
      entity_id: "{{ avr_media_player }}"

  # - wait_template: "{{ is_state(avr_media_player, 'on') }}"

  - service: media_player.volume_set
    data:
      entity_id: "{{ avr_media_player }}"
      volume_level: "{{ volume | float}}"

  - service: media_player.select_source
    data:
      entity_id: "{{ avr_media_player }}"
      source: "{{ source }}"

So, only that its left to figure it out, why does sets volume to 0 for zone1 when turns on zone2? In logs I have no errors or whatsoever.