Trouble saving from .ODS to .XLS(X)

[RamonTavarez]

Hi:

The next file is an .ODS file:
Spreadsheet_from_LibO.ods
<http://nabble.documentfoundation.org/file/n4151561/Spreadsheet_from_LibO.ods>

when I save it to .XLS(X) file format it grows ten times the file size,
compared to the same file type saved with MSO:
Spreadsheet_from_MSO.xlsx
<http://nabble.documentfoundation.org/file/n4151561/Spreadsheet_from_MSO.xlsx>

Is it a bug?