Since some WP or LAY updates the pageurl redirects to the sitename.org/blog/2018/... date url after refreshing the page or if opend in a new tab. In the Main overviewpages the linkadress attached to the project thumbnails is correct (sitename.org/projectname). I can't figure out what might be the problem here. It worked out fine before though. Really hope to get some Help.
As LAY theme needs 'pretty permalinks' I can't use the Post-name option in the permalink WP Setting tab. I am using Yoast SEO and tested with using two sites in one WP Installation but I don't see how this effects the permalink structure.