It seems there is a difference in showing artifacts in multi configuration projects.
Not a defect: What is shown here depends on the number of files, controlled by the system properties hudson.model.Run.ArtifactList.listCutoff and hudson.model.Run.ArtifactList.treeCutoff. One of your build simply has too many files for the tree to be displayed.
I do not understand this issue. What is the difference between the left and the right of the screenshot (except "anzeigen")?
And is it reproduced with a recent Jenkins version?