New columns are added after load

Hello, I encounter the following problem. I hide all rows and columns in a sheet after a certain cell. That works. I than save the sheet to disc, close the workbook and re-open it again. When I now look at the sheet than I can see new columns are introduced. The rows are still all hidden as it should be. Is this a fault in LibreOffice? How can I prevent this behavior? I made an example workbook to show the effect.

Reagrds.

rammy

Example_HideRowsColumns.ods

EDIT_ebot: Link made functionalExample_HideRowsColumns.ods

Beware! Attached files contain macro.