Hi,

Please test it using the fiddle:
https://fiddle.sencha.com/#view/editor&fiddle/2fsb

The grid is shown using some column, the only column sortable is: Name.
Right now:
1) Click on header of 'Mother' column:
The sort works even if the column is sortable = false
2) Click on the checkboxes in the rows:
The checks change its state even if the column is not editable and there is any editor
3) Click on the "RECONFIGURE" button
Right now are shown the only columns 'Name' and 'Father'
- The column name right now is not sortable because the new column config has sortable = false, so this is fine
BUT
The checkbox column 'Father' with sortable = false and no editor, is sortable and editable