Bar chart (query give only one value "time series") but chart is along the time period

Dears,

I have an issue when printing bar chart in case of query that gives only one result that muches one day, the chart is printed along the time period.

In case of multiple result and the time between the results is long, Bar chart is printed along two or three days.

In case of multiple results and we have daily results --> Bar chart is ok.

Data source : SQL Server.

First case: nok

Second case: nok

Third case: ok

Thanks in advance.
Best regards.