The, "Exceeds Max Approvals" lets you know that you have approved the maximum number of posts at one time.
The maximum number of posts you can approve at once time depends on your membership level.
Free members can approve up to 100 posts at a time
Prime Lite members can approve up to 120 posts at a time
Prime members can approve up to 140 posts at a time
As soon as one of your posts is sent, it frees up another approval slot. You can change your sharing frequency in your Tribal Stream settings.