Lexware allows its costumer to share Voucher Bills, with a normed/template PDF download
The PDF scan don't work correctly with this normed files
The cause for this could be a table that is included in the PDF. Tables are not correctly implemented in PDF.
So its seems to be the case that bunq not detect this table correctly and takes either the first amount of the first row or the 🇩🇪 "Zwischensumme" on the first Page, which is not the final amount.
On the Last Page there is a right floated/last outbreaking cell (also row) 🇩🇪 "Gesamtbetrag*" which is the final amount, but don't seems to be detected either
The IBAN and BIC seems to also not beeing detected, which is not good at this text could be easily greped with regex, deflate and parse the PostScript in the PDF.
If you want me to share the PDF with the your support team, just ask me via chat or mail
Lexware also provides some link to the costumer, maybe bunq wants to integrates this as an intent or pinned notification similar to the pay to this IBAN feature
https://app.lexoffice.de/customerportal/voucher/view/[[uuid]]/document