Check the groups mode setting for your course. You can find this from the Settings page in the Administration block.
You can set the group mode to "none", "visible" or "separate". I suspect you have it set to "separate" as this restricts forum views to just your own group.
General help
Missing information and Viewing Groups
اس بحث کو بند کر دیا گیا ہے لہذا آپ اس کا مزید جواب نہیں دے سکتے۔