Slack app_home_opened event calling twice

I have build a slack app.But for onbording process slack app_home_opened event calling twice. I have checked both events are triggered at almost same time.

First event payload:

{
    'token': '*****',
    'team_id': 'T311FQLU8CT',
    'api_app_id': 'K711C41FET3',
    'event': {
        'type': 'app_home_opened',
        'user': 'F511MQLU8KB',
        'channel': 'E211HGWLUKG',
        'tab': 'messages',
        'event_ts': '1590756776.195938'
    },
    'type': 'event_callback',
    'event_id': 'Ev014P7CG7N0',
    'event_time': 1590756776
}

Second event payload:

{
    'token': '*******',
    'team_id': 'T311FQLU8CT',
    'api_app_id': 'K711C41FET3',
    'event': {
        'type': 'app_home_opened',
        'user': 'F511MQLU8KB',
        'channel': 'E211HGWLUKG',
        'tab': 'messages',
        'event_ts': '1590756776.212203'
    },
    'type': 'event_callback',
    'event_id': 'Ev014FLBULHK',
    'event_time': 1590756776
}

I am using slackeventsapi package of python to interact with slack.I understand slack retries the request if we don't respond in 3 seconds but i am responding within 3 seconds to every request.