The short answer is no. This is the way the export function operates.
However. It is possible to modify the report to avoid these problems.
See
How_to_eliminate_merged_and_hidden_cells_issue_from_excel_export[
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Merged cells can also occur in report headers where the field is larger than the columns of a table. We normally add a variable to allow the user to hide the headers for a cleaner export. (flags the visibility property)