Spreadsheets (.ods) that have hidden columns (i.e. from column J to column AMJ) will revert to unhidden starting with column BM through column AMJ. The columns from column J to column BL will remain hidden, but the columns from BM to the end will be visible.
Please what file format do you use to save?
Always saved as file.ods
Please can you attach a sample file where it happens.
And please don't mark as new your own reports, someone else might verify it.
Created attachment 171636 [details]
spreadsheet with exposed columns BM through AMJ
I added a text box in this sheet explaining the hidden columns that are no longer hidden. Columns BM through AMJ were formatted as hidden and the document was saved
[Automated Action] NeedInfo-To-Unconfirmed
No repro with 6.4.
Reminds of column in bug 133327.
Please upgrade LO at least to 7.0.6.
If you still repro please try to find minimal column range where it happens.
Seems like duplicate. If not, please explain.
*** This bug has been marked as a duplicate of bug 128895 ***
You can reproduce this error by selecting from any column to the last one, for that click on the column header and press ctrl+shift+right arrow. Hide all selected columns and test.