## Bug description

*Please describe.*  
- some datapoints show 0 but people will appear in modal

*If this affects the front-end, screenshots would be of great help.*  

## Expected behavior
- amount of people and datapoint should be the same


## How to reproduce

1. demo data clickhouse instance
2. go to retention trends for a day with some people


## Environment

- [ ] PostHog Cloud
- [ ] self-hosted PostHog, version/commit: _please provide_

## Additional context



#### *Thank you* for your bug report – we love squashing them!

posthog/queries/test/test_retention.py
_, _, p3, _ = self._create_first_time_retention_events()
            
            target_entity = json.dumps({"id": "$user_signed_up", "type": TREND_FILTER_TYPE_EVENTS})
            result = retention().people(
                RetentionFilter(
                    data={
                        "date_to": self._date(10, hour=6),
                        RETENTION_TYPE: RETENTION_FIRST_TIME,
                        "target_entity": target_entity,
                        "returning_entity": {"id": "$pageview", "type": "events"},
                        "selected_interval": 1,
                    }
                ),
                self.team,
            )
            self.assertEqual(len(result), 1)
            self.assertEqual(result[0]["id"], p3.pk)
            result = retention().people(
                RetentionFilter(
                    data={