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One possible explanation is that the content of the sheet is being loaded asynchronously, and it takes a moment for the content to be fully loaded and displayed. When the user first presses the button to display the sheet, the content may not yet be fully loaded, resulting in an initially empty sheet. However, as the content is loaded and displayed, the sheet begins to function as intended. Another possibility is that there is an issue with the code and it requires further investigation to determine the exact cause.