I have found a bug in Odoo 13 Invoice Analysis report. you can check this bug in all Odoo previous version too.

Accounting >Reporting > Under Management > Invoices

Group by Customer and select the "Total" and "Untaxed Total" under ''MEASURE'' 

Now check the both Value   4,610.00 and 9,220.00

Here 4,610.00 is the corrected while 9,220.00 is doubling the amount as there are two(2) product lines in related Invoice.

The intresting thing is that if you have three (3) or four (4) products lines in the invoice, it will increase the value (times) as per product lines.

I cannot attached screens here so go to the Odoo demo data and check.