## 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
self.assertEqual(
                self.pluck(result, "values", "count"),
                [
                    [1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0],
                    [2, 2, 1, 0, 1, 2, 0, 0, 0, 0],
                    [2, 1, 0, 1, 2, 0, 0, 0, 0],
                    [1, 0, 0, 1, 0, 0, 0, 0],
                    [0, 0, 0, 0, 0, 0, 0],
                    [1, 1, 0, 0, 0, 0],
                    [2, 0, 0, 0, 0],
                    [0, 0, 0, 0],
                    [0, 0, 0],
                    [0, 0],
                    [0],
                ],
            )
        def test_month_interval(self):
            Person.objects.create(
                team=self.team, distinct_ids=["person1", "alias1"], properties={"email": "person1@test.com"},
            )
            Person.objects.create(
                team=self.team, distinct_ids=["person2"], properties={"email": "person2@test.com"},
            )
            self._create_events(
                [
                    ("person1", self._date(day=0, month=-5)),
                    ("person2", self._date(day=0, month=-5)),
                    ("person1", self._date(day=0, month=-4)),
                    ("person2", self._date(day=0, month=-4)),
                    ("person1", self._date(day=0, month=-3)),