When duplicating styles, styles shifted by one column to the right.

PHPExcel_Cell::rangeBoundaries -> PHPExcel_Cell::columnIndexFromString (Column index (base 1 !!!))
PHPExcel_Cell::stringFromColumnIndex Column index (base 0 !!!)
Merge pull request #268 from Gemorroj/patch-1

When duplicating styles, styles shifted by one column to the right.