Problem description

please check attached images.

Root Cause

protected void exportColumnArray(SSheet sheet, Sheet poiSheet, SColumnArray columnArr) {
		XSSFSheet xssfSheet = (XSSFSheet) poiSheet;
		
        ...
    	col.setCustomWidth(true);
        ...
}

Debug info

• By checking columWidth2007.xlsx, columnWidth2011.xlsx, only custom width column has

  Workaround

  public class PatchedExcelXlsxExporter extends ExcelXlsxExporter{
  
  	@Override
  	protected void exportColumnArray(SSheet sheet, Sheet poiSheet,
  			SColumnArray columnArr) {
  	XSSFSheet xssfSheet = (XSSFSheet) poiSheet;
  		
          CTWorksheet ctSheet = xssfSheet.getCTWorksheet();
      	if(xssfSheet.getCTWorksheet().sizeOfColsArray() == 0) {
      		xssfSheet.getCTWorksheet().addNewCols();
      	}
      		
      	CTCol col = ctSheet.getColsArray(0).addNewCol();
          col.setMin(columnArr.getIndex()+1);
          col.setMax(columnArr.getLastIndex()+1);
      	col.setStyle(toPOICellStyle(columnArr.getCellStyle()).getIndex());
      	col.setCustomWidth(sheet.getDefaultColumnWidth() != columnArr.getWidth()); //patch
      	col.setWidth(UnitUtil.pxToCTChar(columnArr.getWidth(), AbstractExcelImporter.CHRACTER_WIDTH));
      	col.setHidden(columnArr.isHidden());
  	}
  }
  

But for actual solution, we would consider custom width flag like:
col.setCustomWidth(columnArr.isCustomWidth() || sheet.getDefaultColumnWidth() != columnArr.getWidth());
Because users may adjust the width to equal to default width.