Cards color are inconsistent

[friendodevil]

Mostly working but cards sometime default to blue

        - type: custom:bignumber-card
          entity: sensor.kids_water_heater_on_today
          scale: 10px
          from: bottom
          min: 0
          max: 3
          severity:
            - value: 1
              style: 'var(--label-badge-green)'
            - value: 2
              style: 'var(--label-badge-yellow)'
            - value: 3
              style: 'var(--label-badge-red)'