swiper card in tabbed card > preview OK, result extremely large

[TAGVL]

I tried adding a swiper card to my dashboard with below code. The preview looks promessing but once I save it the swiper card gets gigantic and shows 99,9% blank. When I swipe to Neerslag-card I get no preview in the saved dashboard. Code I use is below. Note; I use this piece of code in a tabbed card (code also below). Any idea what I'm doing wrong / what is missing? If I use the swiper card directly on the dashboard, so not in a tabbed card, it seems to work propperly.

Code of swiper card

type: custom:swipe-card
cards:
  - show_current: true
    show_forecast: true
    type: weather-forecast
    entity: weather.xxxx
  - type: custom:neerslag-card
    entity: sensor.neerslag_buienalarm_regen_data
    title: Neerslag

Code of complete tabbed card:

type: vertical-stack
cards:
  - type: custom:swipe-card
    cards:
      - show_current: true
        show_forecast: true
        type: weather-forecast
        entity: weather.xxxx
  - type: custom:neerslag-card
    entity: sensor.neerslag_buienalarm_regen_data
    title: Neerslag
  - type: custom:mushroom-media-player-card
    entity: media_player.woonkamer
    icon: mdi:volume-high
    fill_container: false
    name: HomePod
    volume_controls:
      - volume_mute
      - volume_set
      - volume_buttons
    media_controls:
      - on_off
      - shuffle
      - previous
      - play_pause_stop
      - next
      - repeat
    collapsible_controls: true
view_layout:
  grid-area: middle