while the non-merged cell is numeric content,"NPOI.XSSF.UserModel.XSSFCell.IsMergedCell" most returned "true".
format:ms excel 2007
version:2.0.6.0
Comments: ** Comment from web user: tonyqus **
format:ms excel 2007
version:2.0.6.0
Comments: ** Comment from web user: tonyqus **
You are right. There is a bug in XSSFCell.IsMergedCell. Arguments passed in CellRangeAddress constructure have wrong sequence