Logs in Delivery Edit nog visible after certain date

Hi,

I ran into a problem with permissions and i can't seem to find the answer. The delivery logs on a delivery are visible up until last week after that the logs aren't visible anymore. But the exclusions are still visible. As far as i can tell nobody changed anything in regard to the permissions. What can be the problem? I've got administrator rights so i can see everthing, but i made a test account with the same permissions as the one that's giving trouble and the issue is the same on both accounts as described earlier.  

In the screenshot you can see the folder i'm referring to.