Problem with linking – system error

Hi

This is my first time I am writing in a Forum and I hope someone can help me with our Problem.

I have seen this week that our “linking” is not working even though everything is right linked on the “background”.

Can someone help me with this?
Site: “Über uns” -> Kultur / Arbeitsweise / Team
• There is a wrong linking but I can’t understand why? I have checked everything on our wordpress site and all is correct linked….
• I had also a few error messages and I don’t know if this is a system error?

Thanks for your help and ideas.

Best regards
Jasmin

The page I need help with: [log in to see the link]