The optimizer works fine. The brackets are just for display and do not affect the calculations in the background. The first summary page of the "Maximizing Your Charitable Donations" will summarize your entries. When you finish your optimization selections, the second page will show the balance owed in brackets:
If you reported your donations and used the optimizer but still don't see the donation amount in any of the detailed tax summaries, it means that the software found that claiming this amount will not change the final result of the refund or balance due. So it either removes it or claims the necessary portion only.
I hope this was helpful