Errors in dashboard statistics

[jean-louis67]

The value for the month becomes wrong from one day to the next.
This is a problem I have seen several times. The statistics are correct, day after day.
Then the value for the month seems to reset to zero.

Here are the values ​​for October 27, three days ago. This seems correct. And today October 30 the value for the month is wrong.

Here are the values ​​for October 27, three days ago. It seems correct. And today October 30 the value for the month is wrong.
Thanks in advance for your opinion and explanation.

Jean-Louis