Hi Emma,
Sorry for the trouble caused at your end.
As far as I know when you sort the values in the Excel with Expand and sort, it will sort the selected column and will keep align with other columns in the Excel worksheet.
But if you applied just sort feature for the column it will sort only the applied column and will not keep align with another column. Moreover, re-apply the Expand and sort or just sort will not keep the align with another column as before,
we need to click Ctrl + Z to undo the actions.
Since you mentioned the other can access the workbook and one of the columns sorted without aligning with other columns, I am afraid that it’s not possible to align back previously because it was happened 3 weeks ago. However, as others
can work with the workbook, I assume the file is stored either in OneDrive or SharePoint Online, if yes, you can check the Version History of the problematic Excel file and check the old version.
Open the Library where the file is stored> Select the file> Show actions (three vertical dots)> Version History.
Appreciate your understanding and stay safe!
😊
Best Regards,
Ivy