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There could be a few possible reasons for this issue. Here are some troubleshooting steps you can try:

Check if there is a filter or sorting option applied to the task list that may be hiding the newly added item. Try removing any filters or changing the sort order to see if the item appears.
Make sure that you are adding the item to the correct list or project. Sometimes, if you have multiple lists or projects open in different tabs or windows, it can be easy to accidentally add an item to the wrong one.
Check if there is a bug or glitch in the app or software you are using to manage your task list. Try logging out and back in again, or restarting the app or software to see if that resolves the issue.
If none of the above steps work, you may need to reach out to the support team for the app or software you are using to see if they can help you troubleshoot the issue further.