magento 2 tax rate always 0% and 0,00 € in FE and order

Question

under orders no matter what tax rate a product has, magento displays it as 0 %. And says that tax is 0,00 €.

Screenshot: https://imgur.com/ttl6zQy

Here you can see that the product does NOT have 0 % tax rate set: https://imgur.com/ZmZaj6I

I allready tried the options in Sales->Taxes

I am using Magento 2.3.2

Thanks a lot for your help.