The correct answers are: The board configuration's saved filter or its JQL was modified, The viewer has enabled a Quick Filter on the board, and Some statuses are placed in the Unmapped Statuses column.

The board configuration's saved filter or its JQL was modified is correct because a Scrum board only displays issues that match its saved filter. If that filter or its JQL was changed then issues that still appear in Advanced Issue Search can be excluded from the board view.

The viewer has enabled a Quick Filter on the board is correct because Quick Filters restrict which issues are shown on the board for the current view. Quick Filters do not alter the underlying saved filter so issues may be visible in search but hidden on the board while a quick filter is active.

Some statuses are placed in the Unmapped Statuses column is correct because issues in statuses that are not mapped to any active board column will not appear on the main board columns. Unmapped statuses can be placed in a separate or collapsed column which makes those issues seem missing from the board.

The user lacks Issue Security Level access is incorrect because Maya can see all issues in Advanced Issue Search. If issue security levels were blocking access then those issues would not be visible in search either.

The board has a sub filter JQL that excludes some issues is incorrect in this context because the scenario points to changes in the board filter, active Quick Filters, or unmapped status mappings as the likely causes. While sub-filters can restrict results they are not the most direct explanation given the information provided.

The user lacks Browse Projects permission is incorrect because Maya is able to view the issues in Advanced Issue Search which indicates she has browse permission. Lack of browse permission would prevent those issues from appearing in search as well as on boards.

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