Download links to wrong file

Hey there – on one of my clients site theres currently a problem where i upload a pdf and as soon as i open it, it links to the wrong pdf.

The link is: https://dr-carl-partner.de/news/bfd_download/das-aktuelle-dezember-2019/

But it opens this one: https://dr-carl-partner.de/wp-content/uploads/2019/01/das-aktuelle-januar-2019.pdf