I see two possibilities:

• Excel might store the information differently. If can open the XLSX file with your Excel and then "save as" XLS, how do these "TRUE/FALSE" fields look like, when freshly opening the (new) XLS file in Excel?
• According to the doc, Spreadsheet::XLSX wants to be compatible with Spreadsheet::ParseExcel, but perhaps it isn't. Another module is Spreadsheet::ParseXLSX, which also tries to be a drop-in replacement.

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