Issue Plesk Wordpress Links doesn't work

[Thera]

Server operating system version

Debian 9.13

Plesk version and microupdate number

Version 18.0.44 Update #3

Hi,

suddenly on one of our websites the sublinks from the mainmenu doesn't work and we have questionsmarks in the links: Logopädie

we rollback some backups but nothing works. can you help me?

thank you!