Path conflict in Custom Field.

Hi,

After digging in all the files, without success, I feel I have to refer to you guys.

I created a custom field on a page, which should be called from the sidebar of its parent page.
Parent : https://crossroadinnovation.com/cocreation/
Child: https://crossroadinnovation.com/cocreation/companies

Strangely, when I click on the link that should call to “companies” (button: Best practice), i get directed to some strange url:
“https://crossroadinnovation.com/work/Best practice
And therefore to the “error 404” page.

Does anyone has an idea where this could come from, and how i could make this link find the right path?

Thanks a lot. ??

Kat