ArcPy Copy management creating blank records

Question

I am copying table from source to target. But some of the records of the rows are getting blank in the copied table. My environment ArcGIS Pro 2.x. My script is :

def CopyTables(self, sourceWorkspace,targetworkspace):
       arcpy.env.workspace=sourceWorkspace
       sourceTableList=arcpy.ListTables()
       self.Total = len(sourceTableList)
       self.Count=0
       arcpy.SetProgressor("Setp", "{0}/{1}".format(self.Count, self.Total), 0, self.Total, 1)
       for sourceTable in sourceTableList:
          self.Count+=1          
          arcpy.SetProgressorLabel("Creating table {0} {1}/{2}".format(sourceTable,self.Count, self.Total))   
          arcpy.Copy_management(os.path.join(sourceWorkspace,sourceTable),os.path.join(targetworkspace,sourceTable))
          arcpy.AddMessage("Created table {0} at {1}".format(sourceTable,targetworkspace))
          

Any idea why this is happening?