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The z-index of the checkbox header is the same as the z-index for every row, so when you have a scrollable table the checkbox for the rows overlaps the header checkbox.

When you have an MUIDataTable with responsive: "scroll", pagination: false and selectableRows left as true, and then you scroll up in the table, the checkboxes in the rows overlap the header checkbox.
GitHub

Synctest-hub/how-to-change-state-of-header-checkbox-in-grid-check-box-columnn-programmatically-in-winforms-data-g

This sample illustrates how to change state of header checkbox in GridCheckBoxColumnn Programmatically in WinForms DataGrid. In WinForms DataGrid (SfDataGrid), checkbox in the header cell of the ...