Welcome the Technical Support section. Help us in assisting you by providing us with a concise and descriptive elaboration of your issues. Be specific and if possible, provide us with a step-by-step instruction in replicating your problem.
Specifically, it appears in some cases that the links in the Group toolbar (which toggles between Recent activities, Description, Announcements, Discussions) have broken links for Announcements and Discussions.
The Discussion content appears when you click Announcements, and nothing appears when you click Discussions.
This problem arises when a superadmin visits a group page who is NOT a member of the group.
This issue was resolved in my case by a small change in code
The additional test to determine membership appears unnecessary given the prior line and excludes superadmins who are not members, messing up the display of content under the toolbar.
This is not a problem generally visible to the public (superadmins only) but you might consider fixing going forward.