Fixed col-numbering on setCellValue to 1-based.

Author: devOp1

src/ExcelSheet.php

@@ -229,7 +229,7 @@ protected function renderTitle()
         $titles = $this->normalizeIndex($this->getTitles());
         if ($titles) {
             $keys = array_keys($titles);
-            $col = array_shift($keys);
+            $col = array_shift($keys) + 1; // Add 1 because PhpSpreadsheet is 1-based
             foreach ($titles as $title) {
                 $this->_sheet->setCellValueByColumnAndRow($col++, $this->_row, $title);
             }
@@ -265,7 +265,7 @@ protected function renderRows()
     protected function renderRow($data, $row, $formats, $formatters, $callbacks, $types)
     {
         foreach (array_values($data) as $i => $value) {
-            $col = $i + self::normalizeColumn($this->startColumn);
+            $col = $i + self::normalizeColumn($this->startColumn) + 1; // Add 1 because PhpSpreadsheet is 1-based
             if (isset($formatters[$col]) && is_callable($formatters[$col])) {
                 $value = call_user_func($formatters[$col], $value, $row, $data);
             }