SessionId->7f5445ed-594b-4c98-a5b9-4566073088e5->Conversion-Convert to XLSX->Cells in range A168:C168 cannot be merged because cells in range A167:A169 have already been merged.
Could you please share the problematic/source Excel file that you used in the app? You can compress the file into a zip format and upload it here for us to review.