Wrong decimals from Excel data

Hi all,

i am having trouble reading data from excel file.

Here the data in the excel:

Value column is formatted as a number:

When i load that data to Power BI, i set off aggregations for Month and Customer and Value like this (aggregation with sum and decimal numbers with 15 decimals):

If i create a table the decimals are incorrect:

If we check month 8 on the Excel there are only 2 decimals:

Of course, i can do a Round of the number from the Excel and other workarounds, but what's the problem here?

Any advice?

Regards,

Francesco