The use of merged cells within the template.xlsm file appears to not be handled well when creating the output file. If the cells are de-merged and left-justified, the layout appears to be better but not the same as the template. When the output file is opened, the repair option is selected and the Enable Editing button clicked, the repair results indicate the error is with the first sheet:
Repaired Part: /xl/worksheets/sheet1.xml part with XML error. Load error. Line 2, column 0.
The data appears to be present in the file in the expected cells.

However, when the Enable Content button is clicked Excel generates a compile error in the VB code of a hidden module:

Attached files
Template_NoMerge.xlsm