Automation trigger unexpectedly

Configuration
1

I setup 2 automation to send a notification when temperature over 35 degree, and send a recovery notification when temperature below 35 degree. Sometime, the “Recovery” automation triggered unexpectedly. I am sure before this trigger, the temperature did’t over 35 degree. sshot-1
I can’t find why the automation been triggered. Can any one help?

- id: '1598255649957'
  alias: Office Temperature-back alarm-level-2
  description: Send notification when temperature over 35 degree
  trigger:
  - above: 35
    device_id: 404ce87ab9fd422186ef278312da64cf
    domain: sensor
    entity_id: sensor.office_temperature_back
    platform: device
    type: value
  condition: []
  action:
  - data:
      message: 'Office temp alert: {{ states(''sensor.office_temperature_back'') }}'
    service: notify.line_group_notify
  mode: single

- id: '1598256255515'
  alias: Office Temperature-back alarm-Recovery
  description: Send notification when temperature below 35 degree
  trigger:
  - below: 35
    device_id: 404ce87ab9fd422186ef278312da64cf
    domain: sensor
    entity_id: sensor.office_temperature_back
    platform: device
    type: value
  condition: []
  action:
  - data:
      message: 'Office temp recovery: {{ states(''sensor.office_temperature_back'') }}'
    service: notify.line_group_notify
  mode: single