Plesk wildcard certificate renewal fails

OS: Ubuntu 14.04.5 LTS‬
Plesk Onyx Version 17.8.11 Update #20
Let’s Encrypt: Version: 2.6.1-398

Hello,
I have problems with the renewal of all my wildcard domains.
The _acme-challenge TXT entry is set correctly and also can be resolved externally e.g. MX Toolbox.
When I press “Continue” I get an error which says that an incorrect TXT record was found. I don’t have any idea where this record comes from, definately not from the domain’s _acme-challenge txt record:

Where can I find this invalid TXT record?