Excel export has different values than report

Hi all

I have a weird problem with the excel export of a table that i never had in any other report before.

Its not reproducable with a sample pbix file, so i hope that anyone just has an answer on what power bi is might doing here.

In the power bi table, the totals are all correct. It shows some contracts with the connected revenue and items that are bound to the contract.

When exporting to excel, the sum for revenue and the items is total messed up, revenue ist like 90% higher than in the report. Similar for the items. I tried displaying the id's from the item (additional to the count) then exporting, removing all duplicates, but this also gives a new incorrect value.

I also tried removing a few columns as this might duplicate some rows, but it doesnt change in excel.

How is Power BI doing it correctly, and what does it do? Any ideas why its not the same in the excel export?

Thanks and sorry for not providing any sample data