## Bug description

Monthly Active Users metric seems wrong when choosing "# Number" as chart type.

Number: 
![image](https://user-images.githubusercontent.com/513669/201980874-be7d9c0d-5c9c-4c1e-955c-ea4143c84061.png)

Line chart: 
![image](https://user-images.githubusercontent.com/513669/201980986-b17af929-84e5-4f6a-b7f8-23b7ac8bedbc.png)

**490 != 70**

## How to reproduce

1. Create a new insight using any event and the "Monthly active users" metric
2. Date range = This month + Grouped by = Day
3. Choose chart type as Number => remember value
4. Change chart type as Linear => check last data point

=> the 2 values do not match
=> in other words there's a diff between a total aggregation and an aggregation per bucket of time ?

## Environment

- [x] PostHog Cloud
posthog/queries/breakdown_props.py
breakdown_type: Optional[BREAKDOWN_TYPES],
    breakdown: Union[str, List[Union[str, int]], None],
    breakdown_group_type_index: Optional[GroupTypeIndex],
    breakdown_normalize_url: bool = False,
    direct_on_events: bool = False,
    cast_as_float: bool = False,
) -> str:
    if breakdown_type == "session":
        if breakdown == "$session_duration":
            
            
            value_expression = f"{SessionQuery.SESSION_TABLE_ALIAS}.session_duration"
        else:
            raise ValidationError(f'Invalid breakdown "{breakdown}" for breakdown type "session"')
    elif breakdown_type == "person":
        value_expression = get_single_or_multi_property_string_expr(
            breakdown,
            query_alias=None,
            table="events" if direct_on_events else "person",
            column="person_properties" if direct_on_events else "person_props",
            allow_denormalized_props=True,
            materialised_table_column="person_properties" if direct_on_events else "properties",
        )